Maguire was always going to be a ridiculously expensive and overrated CB. Which is one of the three main reasons why I didn't want Maguire with United. However, under Mourinho, it could have worked. Mou played with a deep defensive line. That means that Maguire's ussues regarding his lack of pace and his lack of football brain would be minimised. He also utilised Matic who was an anchor man + he had Smalling as well whose rapid.
Ole utilise a high defensive line. That makes it very difficult for a slow CB to do well with us. For the record I think Ole got the system right (but he relied on the wrong players). Most teams are happy with just 1 point with us so a deep defensive line won't cut it with United.
Regarding Pogba you can't compare a nutter whom back in his Lazio days would do an interview mostly speaking about us to a WC winner whose been Juventus best CM AND United's top assist man + goalscorer. Pogba is a top top talent. He's tall, he's fast, he's got great dribbling skills, he's physically strong and he can pass the ball the way a Scholes or a Veron could do. The trouble with him is his decision making. He'll dribble when he should pass the ball, he passes the ball when he should shoot the ball, he'll shoot the ball when he should pass it. I can't help thinking that if properly coached and set in a proper system then he could do extremely well for us. Unfortunately we don't have the means to do so. Therefore we're better off if he leaves.
Having said that, my point still stand. Pogba has the talent to be WC. Maguire doesn't