To be fair, he was good at Juventus and had been good for his national team. Its understandable why they thought there was a good player in there. Obviously after a while it was evident it wasn't working. Whether it was his attitude, or the club being shit show, I don't know but it didnt work out. But the Pogba for Juventus and France should've been an improvement on what they had.
Still, I'd understand someone pinning their hopes on improving because a relatively young Pogba might come good more than a shot to bits Casemiro coming back from injury.
I just can't understand who they're looking at to come back from injury that's a big improvement on what's already available. That small defender is decent at best. They were already saying Mount was shite when he was fit.