How to maintain your players several seasons in your team?

[RaiKo]

Look at the Player in the pictures. I mean some skills high and some low or white high grey low.
If you buy 25 yo scout Player, no way you can improve him to 152% with just 250 rests, he is to balanced in his skills.

I got you. i.e. this player promising a good future ahead of him, isn't he ?