Think about this way
In a back 2 of
Bailey Roj0
What does smalling offer as an extra CB? Nothing much more to a back 2 couldn't do by themselves. Blind on the other hand would be able to link the defence & midfield, be an extra man in defence & midfield when needed, be a ball playing defender on every pass he does which he always does, positions himself well to be in front of the defence or behind the defence.
Playing 3 of pure CB's is a complete neanderthal like mistake by Jose - the reason we consistently invite more pressure than needed when playing 3 at the back & why there is a humongous gap between midfield & defence constantly.
Not even Italian teams play a back 3 of straight CB's there is always a ball playing defender guarded by other CB's
Blind may be not right for Jose but that doesn't mean he isn't suited to the Premier league - maybe not in the 90's but he is a consistent defender that doesn't get dominated by speed or strength especially if he played in the heart of the back 3 - he has benefits to offer us that not a lot of other defenders don't.