So I sold my player to a game friend in the beginning of the season and I was curious to follow him. Even after all those matches and 5 time man of the match bonus he has not grown even 1%. I think this is strange even thou this guy isn't the most active player around.
did you asked him about adding new role(s) recently?
That might be the case, but still the man of the match bonus should still count in his overall skill, plus the guy who bought him isn't the most hardcore player and the player is already 26 so adding a new role is a waste in my opinion.
like gabez has said , probably he's teaching him new position so he doesn't gain % and the next season he sell him and win back 1/3 or 1/4 the tokens he lost to get him.