In your eyes, what makes him a "perfectly good" backup player? He has been quite awful in every game he played. Shaky, weak passing, offer nothing offensively, bad tackles. He is super young, I don't want to write him off, but it's certainly underwhelming what he has done so far, for someone like me who didn't watch him at Ajax I don't see yet what was the hype and price tag about. He cannot even be a starter with Fofana, Badiashile and Colvill unavailable, and doesn't put any stress on Cucurella either. For counter example, Gittens definetly hasn't find his best form/position either, but he had some games/periods where we can see he is indeed super talented and got valuable skills. With Hato, I fail to see at this point what he is supposed to be outstanding at and what will make him a starter in the future.