Beorn wrote:If this was true, we would have produced at least 1 Euroleague-level player who is under 30 in the last few years.

Ioannis Papapetrou
Georgios Papagiannis
Dinos Mitoglou
all established as EuroLeague rotation players in the last few years, and all under 30.
Thanasis Antetkounmpo also, although now he's a bench NBA player. But also under 30.
Antonis Koniaris was in Olympiacos' rotation last season, although he didn't do anything, but he was a rotation player and under 30. Who knows about Vassilis Charalampopoulos, but if he ever stays healthy, he will be in a EuroLeague rotation - he's under 30 and developed in the last few years.
Lefteris Bochoridis
Giannoulis Larentzakis
both have a chance to be in rotations of Panathinaikos and Olympiacos this year and both are under 30.
Dimitris Agravanis was a rotation player in Olympiacos, and he's in EuroCup now, but he can obviously play in EuroLeague. He's under 30.
Georgios Kalaitzakis and Alexandros Nikolaidis look like they are clearly going to be EuroLeague level players - both are way under 30.
Hell, even someone like Ioannis Athinaiou was in Olympiacos' rotation in the last few years, and under 30 at the time.
And since we are talking about Greek coaches, they also developed Sasha Vezenkov, who is under 30 and a EuroLeague rotation player of just the last few years. They also developed Aleksej Pokusevski that's probably going to be a first round NBA draft pick this year, etc.
And if we add in very young prospects (under 18), then you have Lefteris Mantzoukas, that is considered to be the biggest talent under the age of 18 in all of Europe.