He gave up on and hated most of his team. As anyone on earth could have seen coming. And of course he wasn't entirely wrong to think we had a lot of garbage in the squad, but his archaic tactics did not help matters.
The timing of his sacking made no sense and must have pissed off Kane to no end, very justifiably. But I am also certain that we were never going anywhere under Jose, whether Kane loved him or not. Maybe we'd have made a fist of it against City in the final, but in the bigger picture the project was dead.
It's possible he gets a tune out of Roma, that league suits his football a bit better and those squads tend to be constructed more to his way of thinking, but the imperious genius of a decade ago is not coming back, football has moved on and Jose never will.