You shouldn’t interpret FTDNA data literally. We all know it’s the prettiest website of all, but remember that it’s a commercial platform and therefore significantly distorts reality due to the random collection of samples. The conclusions you draw from 250 Albanian samples —of which only 10 are PF7563— seem surprising to me.
5 are BY9673* (850 CE)
2 are Z29764* (2550 BCE)
3 are PF7563* (2850 BCE)
A branch of 15 is not enough; PF7573 is neither Albanian nor Illyrian in origin.
The Greeks were the Hellenes, and as far as we know, the few ancient samples have mostly yielded J2 and R1b.
E-V13 seems to have an Aegean origin, though not specifically Hellenic, and BY3830 —the first in that line to have a founder effect with 15 branches— appears to be Danubian/Thracian. As far as I know, E-V13 has not been found in Greek samples dated between 2000–1000 BCE.
That’s why I didn’t include it in the equation. However, E-V13 has 142 samples in total, about 11%, the highest levels alongside M269 when considering time-to-descendant ratios.
The Greeks and Italians have the most E-V13* samples without BY3880—about 40 of 142 (100 are BY3880)—and the Italians 140 of 300 (160 are BY3880), followed by Western countries with a few isolated basal branches.
The Balkan populations, on the other hand, are more than 80% BY3880, and have little to do with their Aegean E-V13* ancestors.
When breaking down the current Greek populations of clade J2 —the present majority— we see that when we go down to M92 (a clade from 6000 BCE), we’re left with 18 samples. The same happens with G2. T is always scarce, and I2 and R1a are mostly of Slavic origin.
None of those have a founder clade.
PF7562, dating to 3200 BCE, has 22 samples (the highest % among Greeks in terms of time-to-descendant ratio). The person with the oldest common ancestor in this group is located in Greece.
Next, the countries with the highest PF7562* ratios are Armenia (10) and Turkey (31 samples).
For PF7563, Armenia has 3 of 10, Turkey 21 of 31, and Greece 20. Of those 20 Greek samples, 3 branches remain in Greece, 2 in Turkey, and the remaining 15 PF7563 branches are scattered across various countries.
In ancient samples, PF7562* has been found in Crete, and PF7563* in Mycenaean royal tombs.
The most probable birthplace and consolidation area of PF7563 is therefore Greece/Crete, within the “Mycenaean” culture between 2000–1000 BCE.