He needs to bulk up but I think having him training with the first team this season will continue to do wonders for him. I don't love sending him on loan when he's so young - let him grow up with the squad and then assess next year if he looks like he needs first team minutes. I have faith in Arteta handling a young CB as he's already done it with Saliba but man, I can't remember the last time I've seen such an impressive CB prospect in England.