As it happens I think there were problems with both the Van Gaal and Mourinho appointments when you made them. Van Gaal left Bayern under a cloud and the football they were playing had drawn
quite a lot of criticism - they finished 3rd in his final season behind Dortmund and Leverkusen. And as far as I'm concerned you only hired Mourinho because we hired Pep, as some kind of direct response to reignite the rivalry between them. He'd been sacked by Chelsea with them trapped in the bottom half of the table and managers like him only have a limited shelf life. How managers join you is often how they leave you and that's exactly what happened with those two.
I see no reason why Ole can't work as United manager. I want him to work well as United manager. As I've said, he seems like a genuinely humble guy who's just grateful to be back at United. He's got your talented players working how they should in ways Mourinho never did, and it seems like an exciting time to be a United fan at the moment. But there have been signs that the football he plays isn't completely sustainable, both on a game-by-game basis and in terms of player fitness, and I'm intrigued to see how long that carries on. I'm also interested in seeing how you approach transfers, whether the club will make the decisions or allow Ole to flex your financial muscles. It's going to be interesting to watch.