Mainoo is also more suited to playing higher up the pitch, the things he's good at lend themselves much more to that rather than a deep lying midfielder, and his biggest weaknesses are in the areas a deep lying midfielder needs to be good at. Unfortunately for him, both Mount and Bruno are much better players higher up the pitch.
Yes he is better higher up the pitch, but that doesn't need to be as a 10. Ideally you would have a midfield that balances qualities. The playmaker type, who recycles possession well, and is good with the ball at their feet, can be either a 6 or an 8. Just like your ball winning midfielder can be the 6 or the 8. It is just a question of where you want to do it, and how the team plays. Pressing and winning back possession is also a team responsibility, not just on individuals. For me, Casemiro playing as the deepest player, with Mainoo slightly in front of him, and Bruno or Mount alongside, balances everything you need in a midfield. There are likely players who are better in each position, but it's not about individuals, it's about the cohesive qualities of the players you have. Mainoo playing as an 8 is, for me, his ideal role. He just needs a lot more minutes in that role. He has already played it to a very high level. It also assumes that without the ball your 10 drops into the central positions to form a three, which gives you solidity, and with the ball is willing to come deep to link up with the 6 and 8 to play triangles through the middle. In my mind 4-2-3-1 and 4-3-3 are two very different formations. In a 4-2-3-1 you are playing with two pivots, with your 10 sitting in the hole. This puts a lot on those two deeper lying players in terms of their qualities. In a 4-3-3 you'd expect the three to press and progress the ball as a unit, with your 6 sitting as a sort of anchor, and the 10 having more attacking license.
Arsenal just beat Villa 4-1 with a midfield of Zubimendi, Merino and Odegaard. There is very little steel in that midfield, and not a ton of athleticism either. Yet is worked cohesively as a unit, and dominated the play. Usually they would have Rice in the mix, who brings a lot of everything to the game, but the point is that a midfield trio of Casemiro, Mainoo and Bruno should be able to dominate 80% of the PL teams, and be very competitive with the other 20%, if they play cohesively and the shape and instructions are correct. People are way too focused on individuals and their qualities, and not enough on the system and approach. Too often United have been a team of individuals, with the solution always being to replace the individuals when things aren't going well and expect better results. This results in a lot of money spent with little to show for it. Players then leave and look better elsewhere because they play in a cohesive system that minimizes their deficiencies and maximizes the team's ability to perform as a group.
We will continue to covet high priced midfielders, and then slag them off later, until we develop an approach that emphasizes the team rather than the individual. I'll give you an example....I think Bruno is our most effective individual player. His stats constantly back this up. He can see a pass, and is willing to take a risk, that very few players are willing to do. This often results in chances created. But having Bruno in the team means, in my opinion, that you have to be set up to be defensively very solid, and transition rapidly. Why? because Bruno also turns the ball over, a lot. This affects the momentum of the game. He goes for that low percentage, defence splitting ball a lot, and while this leads to goals, it also leads to freuent turnovers. So you have to be prepared to defend when that happens. You also have to be prepared to make constant runs in behind to make the most of his high risk strategy,
If you want to dominate possession, probe for openings, press in a controlled manner, then you select Mount over Bruno. You don't get the hollywood pass, or youtube moment of a sensational defence splitting pass, but you do get a hardworking, defensively responsible player, who treats the ball with care and has an effective attacking instinct. For me it is the epitome of the debate of systems over individuals. The best midfield doesn't necessarily include the best player. And if it does, it is because we are playing a system that maximizes his qualities and minimizes his deficiencies. But again, that would be system over individuals triumphing again. The problem is, we want to play a player like Bruno as the heartbeat of the team, we want him to do all the high risk, sensational stuff, but we also want him to play that careful, considered responsible football to recycle possession. That's having your cake an eating it. By definition only 10-30% of those high risk passes ever comes off. So when he does try it and it fails, we can't all be committed upfield and leave ourselves exposed to the counter attack. Something which has constantly happened. Amorim using him as one of the two CMs was just mental.
Re Kobbie liking that Instagram post. It was childish and immature. The sort of thing a 20 year old does. He should be quietly disciplined and we move on.