I'm not convinced by the Jose appointment yet.
Jose went a bit bonkers at Chelsea and that could be permenant. Van Gaal can't have always been as gone in the head as he appeared this season. Jose might snap back to reality but or he might get worse.
The second reason I'd have some reservations is that team s morale bounces back after a change of styles. If they went for klopp who gives players that energy and flexibility and attacking football I think the players would be on cloud 9 all season. But to go from boring van gaal to years of boring Jose the players might fell like they've just got a kick in the stones.