Skill progress

[Steppenwolf]

are all of them fast trainers?
Toure and Roberto Carlos perfectly fit in the fast trainers pattern...
It looks to me that 8-stars pattern goes half down than 7-star... and 9-star pattern goes half down more than 8-star...
That means 8-star youngsters, age 18-21, fit in pattern of 7-star, age 22-25 players...
and 9-star youngsters, age 18-21, fit in pattern of 7-star, age 26-29 players...

It seems when players reach 8th star, it's not wise to power train them anymore...