I think he'll see Jesus and Sane as a hindrance rather than a help to be honest. Both are very young and block his potential first team position for the foreseeable future.
I'd also add that when I've seen him play, he's put in the graft off the ball as well as the skill on it.
If he's to reach his potential then he's going to have to be playing regular first team football at a top level before he's 20. Signing a contract at City now means that he has to gamble on himself getting those first team opportunities at City. History, unfortunately, doesn't favour our club in this fight and we have several young, expensive wingers that he'd have to usurp. I don't blame him at all for rating his chances better elsewhere.