I think there is a good chance his muscular problems will fade away in the next seasons. Not to say he's gonna be some phsyical specimen, he will never be this profile, but he is likely to stay fit far more often as he matures a bit. But it's tough to get that type of stability if his body is still in the formation period.
I can tell his body is changing because, not kidding, he looked like some of my classmates from high-school when he started out three years ago.
It was a mistake from the club to play him so much so early no doubt.