The Greeks are in the Mediterranean cluster. The E-V13ers are either in a Central European-North Balkan cluster or in the Caucasian. The Caucasian cluster being shared with an R-Z93 and its clearly Cimmerian derived/Thraco-Cimmerian. Just like the N haplogroup carrier with steppe ancestry. We already have R-Z93 from the South Eastern Thracian context as well and from the Pannonian too (IR1, Mezocsat Thraco-Cimmerian). So at least the Caucasian E-V13 likely being from the Thraco-Cimmerian sphere and I think its likely we're dealing with a group of mercenary cavalry or archers from the steppe/Carpathian basin of largely Thraco-Cimmerian background.
The 2 Central European/North Balkan E-V13ers might be from many places, I had a debate on Anthrogenica, let's say its disputed at the moment.
But this paper proves that E-V13 was not big in ancient Greeks. Might have been still there, in the North, in specific city states, but it wasn't big.
The Thraco-Cimmerian connection being confirmed and the 2 Central European/North Balkan samples need to be assigned properly, where they fit the best.