Dianatomia
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You may read my analysis of Greek J2b2-L283 here and here, which was written before we had the Mycenaean ancient DNA. My analysis pointing that current Greek J2b2-L283 subclades are unlikely to be present among Mycenaeans, and are as a result of later migrations from further North (Dorians, Illyrians Thracians, and later Vlachs and Albanians), stands.
Regarding J2b1-M205, as Dema pointed out, in the mainland Balkans (outside of the the Mediterranean), all of it seems to fall under J2b1-M205>PH4306>Y22066 and has a TMRCA of only ca. 900-1500 years, which suggests it was likely not present there before the common era, hence the reason why (Gheg) Albanians are almost completely lacking it. Unfortunately, many people don't understand haplogroup J2b quite well, so they assume they are part of the same migration. True, J2b1-M205 has a TMRCA of ca. 6000 years, but in ancient DNA is consistently being found in the Levant area. It's distribution is actually quite reminiscent of some branches of haplogroup J2a.
So far the only J2b that has "deep roots" (high TMRCA) in Europe, and found in ancient DNA from the Bronze Age or before (in Croatia) is J2b2-L283, which as we know reaches maximum frequency among (Gheg) Albanians, while being quite low everywhere else, albeit with some representation among Vlachs and Greeks.
We don't know whether Myceneans had no J2b at all. The proto-Hellenes may have had some, but in the South they mixed with Minoan natives who where the overwhelming majority. In the North areas of Greece, the peoples may have been slightly different. Areas of Thessaly and Epirus may therefore had a lot more j2b than South Greece during the late Bronze Age. In any case, we do need more ancient comparing material. For now we only have two Myceneans from Southern mainland Greece. The others are from Crete. So I am a still a bit reserved as to whether Myceneans didn't have J2b. Esecially since old J2b1 is in seen in Greece and Italy. The thing is that if we do find traces of J2b in ancient specimens of mainland Greece, we will have the first evidence of some genetic variety within the Ancient Greek genetic mainframe.
As for the Ghegh Albanians, they have evaded old Mediterranean J2b1 as well as the younger J2b1-M205>PH4306>Y22066. It seems to me to be evidence of the fact that they were pretty much isolated until recently. And that they expanded rather rapidly.