I've seen it before when United signed Sanchez and pushed Martial to a different position. Fecked everything up in the end. Rashford won't be benched, he's the new golden boy and 19/20 has been his breakout season, he's been one of the best attackers in the league. Currently United are paying about 450k/week for both Martial and Rashford and both of them are delivering the goods, can't see United changing that.
Greenwood is perfect where he is, 6 scorer in 8 games, i don't see him moving to the central position in the next couple years.
I think Klopp sees it differently otherwise he would have asked Liverpool to pay the money required for Werner. He's been more up and down this season but overall very good, IMO. It's been said before without him Mane and Salah couldn't be playing the way they're doing now.
I don't remember Mbappe spending much time on the bench after he forced his way into Monaco's starting eleven. Sancho and before Dembele have been playing week in and week out, anything else should be disappointing for Greenwood. Just because he didn't cost a shitload of money doesn't mean he's not as good as someone like Sancho. United should do a loan deal for someone cheap and continue playing that front three.
And yes, give Pogba a blank cheque, he's Uniteds best and most important player, IMO.