The reason i mention u21 players is because i find those to be a source of ruined players in this game. They are many times just a race to get high primary skills and nothing else. And that is what i call a wast of a good player.
Actually I know of some folks that have worked off just primary training with trainees that already had secondaries in place...basically pick your position, say PG. Find PGs that got their offence and their defence and high IS/ID/SB....but just have low PA or OD...that would be a great player (if you could find 2~3) to just plug in to 48 minutes at PG. You could do that for a season/half season...by the time you get to the playoffs etc. then you could have those OD/PA stats upped a bit...and also they are gonna have much more skill compared to the salary, for that stretch atleast.....