It
is possible, but only under very special circumstances:
(78242.338)- He is a very young player (18-20)
- He ist very tall so he can learn IS more quickly than a smaller player
- the team has a lvl 7 Trainer
- he must have had a very high subskill
In addition, there are "veterans" who would say, that was possible only in a Center-Skill that is far behind the other Center-Skills and so can rush up faster (in this case IS or BLO). I would not have worked with ID or REB, as they are very high yet.
But these cases are very very rare, so you shouldnt expect that.
By the way, as long as players have not reached their potential-Cap, a player does not skill
faster because of a high potential, he only skill
longer .