I recall Greek I2a-Din being mainly I2a-Din-N rather than I2a-Din-S, and indeed the Greek DNA Project at FTDNA seems to have a ratio of about 7:1 of I2a-Din-N to I2a-Din-S. That alone is a pretty good argument against the Serbs bringing I2a-Din to Greece. But is it an argument for the Vlachs? I'm not quite convinced... take the fact that Vlachs have at least as much J2 as I2a-Din, but that Northern Greece is actually a low point for J2 in Greece. R1a is also elevated in Northern Greece (18% per Maciamo's table) despite Vlachs having relatively low R1a (10% per Maciamo's table). So we're perhaps looking for an I2a-Din-N group with R1a to spare and not much J2. Perhaps Bulgarians? I'm not sure what their I2a-Din-N to I2a-Din-S ratio is, though.
Vlachs are smaller groups, not one as somones would like.
for example the |Kutsuk Vlachs are from dismiss of 4rth Legion in PalaioPHarsalos,
Pharsal-os is the same word with Versailles and simmilar the other village names, next to where R1a in Greece has its high 24%
Mengle Vlachs are a group of Vlachs who are called Armanesti their connectiomns with Other Vlachs is limited and seems to be in center of a R1b area, they are consider as latinised locals
Moesio Vlachs, Most of them came until WW1 from Moesia, Rumania Bulgaria or MOLDO-WALLACHIA significant E-V13
Aranto-Vlachs, they are from Moschopolis today Albania, they left their area when Albanians burn it to the groud,they carry J2b among them
Scando or Stranza-Vlachs, they are from SOUTH and East parts of Bulgaria, an area where Scordisci stationed before devastate to minor Asia,
they are nnot connected among them, neither genetically, neither by look
for example ArvantoVlachs have enough dark, while Kutsuk Vlachs have big % of Blonds, and Mengle are very tall in the areas, they live in the areas of Makedonian Lokroi which were considered the tallest among Greeks from antique and are dark brown
we can not combine Arvanto-Vlachs with Kutsuk Vlachs etc etc, the one came from Epirus Nova and the other is from WEST of ALPS Roman Legions
their population of all groups except Kutsuk Vlacchs is limited, you can find them even in Wiki,
their linguistic are tottaly Different,
Moesian Vlachs were billingual, from their early written we find the modern Thracian Idiom, meaning they were connected with Constantinopolis Greek more, than central Greece,
Most of their families have a Hero in the Greek revolt in Danubian principallities and Iasion
generally Vlachs are either kelts from WEST of Alps, other Pannoni Kelts, other latinised local who worked in Roman Villas Villachios Βιλαετια (Villaet)
in WW2 Italians notice that speak a latin language, and they propaganda them to make an indipendent zone, but noone followed
besides there vlachs in each country of Balkans, and most are diffirent communities, except the Moesians, the Wallachs
from Croatia to Greece and from Albania to Bulgaria, in Turkey such community at least as i know does not exist
in Balkans romans dismiss many times legions, as the 4rth the 5tη Cinqueari etc, where a legion was dismissed, land was given, and creation of latinspeakers.
for example there are Vlachs in Montenegro or Bosnia, or Serbia or Croatia, that theymight not even use the termination Vlach