Why?
you just took a general data found here and you make conclusions,
no further DYS, no mtDNA no autosomal data,
since you could found the data , you can easily find the data I tell you,
by what I remember is M319 M 339 L70 although may I am wrong,
Y-Dna is only one of the tools, a good one, but just one,
J2 Hg is a strange Y-dna that has mother land the areas around of R1b and G,
remarkable is that in India we find almost little to zero R1b but big J2
J2 can be the alternative of R1b and R1a in IE theory with G
J2 can be the Aryan linguistic group,
J2 is connected with Greco-Aryan and Indo-Iranian population, from Zagros devastate to India, and from Zagros to Greece (Διας Ζαγρευς, Κουρητες Etc) and rest mediterrenean colonisation,
it is still unknown when entered Europe, but some suspect that Tripolye was J2a culture,
until today only G is found in Neolithic Europe and R1b and R1a with the known Tumuli theory,
but when did J2?
from Crete we realize that was present at iron age 900-1100BC, but still we don't know if entered same time with G, after G and Before R1 or after G and R1.
in fact Varna Necropolis skeletons are very helpfull.
the presence or lack of J2 or R1 is catalytic to understand many.
the Truth is I myshelf need lessons to understand more genneticks,
but the first lesson i learn is that the highest peak % does not count,
meaning that a population with 80% Hg can come from a population with 2% of the same Hg,
there good genetists in the forum, better than my ignorance to explain why to you.
I researched M319 and this is what I found from the article "Paleolithic Y-haplogroup heritage predominates in a Cretan highland plateau":
"Of the 57 J2-DYS413 chromosomes in Crete, a total of nine chromosomes are derived at J2a1h-M319 (Figure 2). This mutation was recently discovered in one Iraqi and two Moroccan chromosomes24 and to our knowledge, it has not been reported in any other population. Interestingly, seven out of the nine Cretan M319-derived chromosomes have the (CA)16-(CA)18 genotype at the DYS413 microsatellite marker, a pattern that was not observed in any other DYS413-derived lineage. A prominent frequency of DYS413 (CA)16-(CA)18 chromosomes in Crete, and particularly in the prefecture of Chania, was detected in the past and was attributed to a founder effect in the island.7 It appears from our results that this founder effect is associated with the introduction or origin in Crete of the J2a1h-M319 mutation."
M319 is found among greeks at 4.3% only in the island of crete. So even this questionable autocthonous greek hg is found among greeks at an insignificant percentage.
M339 and L70, you claimed them, you prove them to be native of greece...
If you look at Figure 4 in the above article, one can realize that albanians and greeks are closer genetically than any other 2 populations in the mediterannean (at least as far as y-DNA is concerned).