I disagree and I am not saying he should bulk up like a beast. But he got easily outmuscled a couple of times and lost the ball where he shouldn't have (partly due to poor decision making as I noted earlier). In order to flourish however, he needs to get the basics right. Technique and dribbling skills is already there, he needs experience and determination in order to get the realization. Some strength would also help him not getting shoved over too easily as his balance otherwise is good.
Look at neymar. He is a fuking toothfairy and that doesnt impede him to dribble past players and create havoc. Obvs Ney is a huge talent... but Coman has pace a can dribble. He just needs time and experience. I hope he gets it here.
Btw
http://www.football-italia.net/69280/coman-'i’ll-stay-juventus’
Bascically saying he wants considerable more playing time...and i think we should consider giving it to him
