If you're buying at Lvl2 a Player with 29 quality, you can train him easily to 30 which means Scout and Six Stars´. During Season
this player also collects SkillPoints in Matches and Training, so you may get him close to 34 Quality. Next Season he has only 5 Stars,
But you can train him up to 35 Quality, which means Scout again (6 Stars). But keep in mind, younger players gain Skill easier than older ones.