I think it's close to the time when Skal gets some minutes over Giles. He's having a hard time adjusting to the physicality. I'm not sure he'll ever play center but he can't right now for sure.
He's young and there is plenty of time. I'm not sure if he's wearing down already either because as more games go by he seems to be less and less active. He's been caught standing still a lot in this one.
He will in the weight room. On the floor he's just going to see more nights like this. He can get them back offensively but it's hurting more on the floor than it's helping.
I'm not sure about weight, nor am I sure you want him to add much more weight considering his knee situation but he can get stronger. That will come with age and some training.