I don't think it can be understated just what bringing someone in on such a financial salary disparity can do to the changies. Particularly with some of the ego's in this one.
With little bits coming out here and there it appears that's an underlying problem that could implode everything. And Mourinho narking at some of those ego's isn't helping himself in that regard either.
Nah, no one gives a **** about the money tbh. It's much, much simpler than that. He wants them to play against their natural instincts. Pogba in particular, and everyone is a bit peeved, because its not working.