Yesterday I bought 5 star player, few points from Scout. I don`t have so much experience in training, i`m only Level2, so that i want your opinion, because i think is so young and so expensive, but seems to improve so slowly. Is this player, Michailidis, slow training?
Screenshot from stretching with normal intensity:

And this is from last match, in wich he scores 4 goals:

Considering his age, my plan was to keep him at least 2-3 seasons, but if is not a good improver, i don`t know what to say.
It`s normal gainer, or slow training? Is 1 SP from Scout, should I sell him now and try buying another U21 or should I keep him?