Research project initiated. I'm going to focus on the Top 8 Leagues in this article:
https://www.espn.com/nba/story/_/id/...ll-leagues-nba - it is an older one, but it's the most relevant I could find to set a baseline in order to prevent hunting down some 18 year old prospect averaging 45 ppg in some backwoods Brataslavan league.
Note, however, that I do think there is an immediately difference between Doncic, Sengun and Topic that needs to be taken into account. Doncic and Sengun did their work in the top 3 leagues (per the ESPN rankings), whereas Topic was doing it in a much lesser league on a much lesser team that he got loaned to (and presumably could get more PT and spotlight). Topic's first two ABA games back with Red Star did see a drop off in performance and efficiency, and he certainly did not impress in the two EuroLeague games. While it is a small sample size, I think it is too premature to either write Topic off OR to automatically put him in a list with Doncic and Sengun of 18 year olds who "kicked ass" in European leagues.
None the less, I'm going to do some research and we'll see if it holds up.