The tricky thing is with this signing, (if there is anything in it at all) is that Montoya is playing the best football of his Albion career to date.
To me, it's far from clear that Walker-Peters has the credentials to get into the team in front of Montoya. Yet he is also too old for the...
Given his age and relative inexperience, I suppose we're thinking we can improve him here. It's also a clever tactic. As soon as Mourinho goes to a club, sign the young talent who know they'll never get a game.