I know some good players from YC but they started at 1,9/10/4 and 17,5 y old. When they come at 1,5/10/4 and 17,99 y old they are really crap.
BTW. In 10 seasons I got 1x LA 9 and 1x LA 10 from the best academy and change youth in academy for 1-1,5 mln each seasons. So 25 mln for 2 seasons on YC is huge but to get good rookie in GKO costs a lot this day
Looks like the best way is buy 17y 3/10/3 for 4 mln so its pretty easy