Even for non-fast trainers they train reasonably fast that their market value will increase a lot for lower levels.
yeah, agree to that - specialy low class nordgen have descent numbers.
The problem is that young players (even if they are not fast trainers) attract many managers and there are bidding wars. So sometimes I prefer to fill my team with older players 5*, 25-27 y.o. . I 've found x-scout list players (from upper levels) who make a second career in my team