Depends what you mean by knowing what he's doing. If you mean keeping us in the top four every year, building teams within our own financial means and showing us an attractive style of football, then yes you're right. I don't take that lightly. Other managers have won trophies but failed to finish in the top four (like Benitez).
If you mean winning trophies, learning from his/our mistakes and building on our weaknesses then you're wrong. He hasn't done any of that for the best part of a decade. Only the first part has anything to do with money.