First, Monterou and Encrusted Pottery has nothing to with Balkan-Carpathian groups from East Serbia-West Bulgaria and South Carpathians like Tei, Verbicoara and other related groups, also the sampling for these related groups is near zero, since they cremated their death.
Secondly, now you went too far by even saying couple of V13 in Balkans might not be Slavic, if not an exaggeration then what is it?
You can freely check any independent databse and V13 doesn't exceed 2-3% in any Central-North Slavic countries. Likely in Ukraine/Russia they were Byzantine traders/priests/mercenaries etc, etc, etc.
I think you misunderstood what I'm saying, because I just implied that there was a split of Dacian lineages which moved to Slavs early and to the Balkans in Late Antiquity, probably even overlapping to some degree on the time table, without having a direct connection to each other after that.
Those which moved to the Balkans, of those lineages, which branched from those ending up in Slavs, were never Slavic and moved to the Balkans before the Slavs, but with the resettled Daco-Romans and Free Dacians. There is however the possibility that some were brought by Slavs, but that wasn't my main point, but rather that we deal with independent movements of E-V13 lineages coming from the same Dacian tribes, one time with Romans, another with Free Dacians and a third time with Slavs.
The other thing is that we have samples from EBA Bulgaria which point to a population similar to Monteoru, part of the Danubian block, high in WHG, high in I2.
We also have dozens of samples from Encrusted Pottery in Hungary, Northern Croatia, and one from the Balkans too, all having the same profile autosomally and one group - the Balkan sample was I2 too! So we got the confirmation that Encrusted pottery had one autosomal profile and this profile spread into the Pre-Channelled Ware area of Northern Bulgaria with Garla Mare. This is no conjecture, but a proven reality.
So we have people from earlier and later periods which were both I2+G2 and WHG-rich in Bulgaria, plus the R-Z93 steppe groups on top and Greco-Anatolian influences in the South. That's all confirmed and known by now, that's the pre-Channelled Ware situation.
The cremating groups which moved in, at different points in time, into Bulgaria, were all connected, which includes Belegis and Verbicoara. Vartop for example is Channelled Ware on top of Garla mare.
Both Paracin and Zimnicea-Cerkovna too came in from the relative North, and kind of preceded the main Channelled Ware expansion - whether they were E-V13 heavy or not, whether they were directly related to G?va or not, they came from groups of the North Balkans Southward:
Alongside pottery considered characteristic of the
Brnjica group, there is also pottery of different styles
recorded alongside Brnjica sherds at sites in all re-
gions of this group. These present features of other,
older, pottery traditions from this same region. Such
finds are also found in neighbouring areas, such as
sites where Paraćin group pottery dominates. These
older forms are primarily characterised by their orna-
ments in the form of incised spirals or rectilinear mo-
tifs, rows of triangular or oblique punctate dots, often
filled with white incrustation. They may also have in-
cised lines that form geometric motifs, inscribed or
hatched triangles or deltoids, and incised strips filled
with double rows of punctate dots. These ornaments,
both in technique and motifs, are very close to pottery
from the Oltenia lowlands and the region between the
Balkan Mountains and the Danube in the Middle and
Late Bronze Ages. They have been recorded in several
of the pottery groups in the area, and there may be an
element of these being defined differently by different
authors, variously called Balta Sarata, Verbicioara,
Govora, Cherkovna, Zimnichea?Plovdiv, Tei IV.17
So there is no doubt about their origin from around Oltenia, and this might help to understand why later Channelled Ware could so easily spread on top of them, in my opinion because we deal with related people, especially if combining the pottery style and other elements of their culture with cremation. Tei is an outlier in this respect, and I consider it closer to Monteoru. But in its late phase, it was largely being taken over by the cremating groups from Verbicora, which created the Govora horizon. There are a few small remains which practised inhumation, but if those get tested, I doubt they represent the main block of Govora, which was clearly Verbicoara shifted - which however can't be easily tested because they burnt their dead.
Therefore this is a possible early entry point for some groups, but the safe starting point is definitely with Channelled Ware:
From a chronological perspec-
tive, it is important that this channel decoration has
not yet been found on sites dated to the early phase of
the Brnjica group (Br C?C/D), such as Svinjarička
Čuka, Medijana and Svinji?te.24 The earliest appear-
ance of channel decoration in the area of the Brnjica
group is recorded in Končulj (Pl. IV/2, 3), in a context
dated to the 13 th century calBC (Tab. 1). At Končulj,
the channelled ornaments are reminiscent of those on
the pottery of Middle Bronze Age groups in southern
Pannonia and Late Bronze Age groups in western Ser-
bia. That said, the vessel shapes on which this occurs
in the Ju?na Morava basin have few if any similarities
with the vessels of the LBA in western Serbia. 25
The semi-globular channel-decorated deep bowl from
Končulj (Pl. IV/2) has its closest analogies in the Balta
Sarata IV group in southern Transylvania, which also
dates to the 13 th century BC. 26
Interestingly, the author points to similarities with the Wietenberg culture:
A bowl very similar to
the S-profiled bowl with two handles and short chan-
nel decoration elements on the belly from Končulj
(Pl. IV/3) was discovered in a LBA grave in Dobrača,
?umadija.27 These vessels, mostly bowls with bellies
decorated with wide, oblique channel decoration, close-
ly reminiscent of the bowls with twisted bellies char-
acteristic of the Brnjica group, are very common in the
Wietenberg group in Transylvania.28 Channel deco-
ration as a decorative device was present in this group
from the end of the Early Bronze Age (phase A).29
Channel decoration executed in a similar manner
to that found on Brnjica vessels was recorded on ves-
sels from the late phase C of the Wietenberg group,
which corresponds to the end of the period Br C in
Central European chronology. 30 Other analogies with
the pottery of the Wietenberg group can be observed
in this group, including handles with plastic exten-
sions at the apex, spiral ornaments, incised or hatched
triangles, and double rows of opposite triangular
punctates. 31 Other features known from the Wieten-
berg group include series of punctates (*****-marks),
as seen on sherds from the sites of Svinjarička Čuka
(Pl. I/1?4, 9?12) and Mediana (Pl. II/4, 5, 10, 11, 14),
and other sites where Brnjica group pottery is domi-
nant in assemblages.32
Oblique channel decoration is also a common mo-
tif on pottery at LBA sites in the south-eastern part of
the Carpathian Basin, and dates from the end of 16 th
to the early 13th century calBC.33
Not just ceramic, but also weaponry, especially Naue II-Reutlingen type swords and casted, especially flame shaped spearheads:
By the end of the 13 th and the beginning of the
12 th century BC, a large number of bronze finds were
periodically being deposited in the Morava?Vardar
corridor. Some of the metalwork types originated from
western regions of the Balkans and the Pannonian Plain
as well as from Central Europe. A few Reutlingen-
type swords that had been developed by communities
in the Po Valley and Pannonian Plain are known along
the Morava?Vardar/Axios communication corridor.99
The sword was developed by Br D at the latest, and it
appeared in the Central Balkans before the end of the
13th century BC, which is clear from bronze hoards in
the Pannonian Plain. 100 When we look at the wider
area of the interior of the Central Balkans, specimens
were found at Tekija near Paraćin,101 Golemo Selo 102
and Pudarnica 103 near Vranje, an inhumation grave
from Donja Brnjica, 104 Lakavica, 105 Delčevo106 and
Mirovo (variant Konju?a). 107 This latter example is
dated to Ha A2 and is exclusively connected with the
area of the north part of western Serbia and Mačva. 108
Analysis of tin isotopes δ124 showed that the swords
from Golemo S e lo near Vranje and another from
Maovo in the southwest Pannonian Plain have similar
values (0.21 and 0.28) to each other and the sickle,
pin and axe discussed above.109
Parallel to the appearance of Reutlingen swords,
the so-called flame shaped spearhead was also intro-
duced in Ha A1. This had no predecessors in the MBA
Central Balkans, and its distribution is similar to the
swords. 110 Examples come from an urn from the cem-
etery in Gornja Stra?ava,111 from the settlement of
Velika Humska Čuka112 and Malič at Lake Ohrid.113
https://www.researchgate.net/public...onze_age_Central_Balkans_in_light_of_new_data
Therefore we have an earlier expansion of related groups from the Carpatho-Balkan block to the South, spreading cremation and specific ceramic, and a later, the biggest and most massive expansion being with Channelled Ware, which introduced not just new ceramic but also a whole range of weaponry, like especially Reutlingen swords and casted, flame shaped spearheads.
Now these finds go down all the way to Lake Ohrid, and I would say that some E-V13 should have been in place latest with those movements of the LBA-EIA.
However, that's not the end of the story, because as I explained before, there were multiple later movements as well, most notably, the resettlement of the Daco-Romans and Free Dacian tribal people in particular, which reached a peak in Late Antiquity. Their late entry point was a bonus, because of the catastrophic and weak Roman demography. They replaced earlier inhabitants of much of Moesia in particular.