I think the best scenario would be for him to spend 1 more season with the B team and buildup his physique during that time.
Valverde will be gone next summer and the elections are also held in 2020 so he could start fresh under a new manager and new board.
I think he should be aiming for proper senior football. A loan to the Eredivisie or even Bundesliga would do him a world of good.
Is this guy really not good enough for the first team? am I missing something? Everytime i watch him with the first team he is one of the best on the field. For my part he is playing much better than alena...