I don't think there is any danger of this being a case of genius on my part. Even as the proponent of the theory I can recognise its weaknesses. However, my thought process is the following (I'll bullet point):
- The heat map for the "LWB" is typically the sort of heatmap you would expect for a player playing as an attacking wide left option. A role Mount is suited very well to.
- One of Mount's biggest strengths is his work off the ball, his pressing, his engine etc. He's either fit or he isn't. A fit Mount should be used according to his strengths.
- The number of defensively minded players is much less significant in my view, than the orientation of the system. Much of the defending from out wide is just about closing channels, pressing correctly, tracking runners, and cross prevention. All things that need to be done by a diligent, focused, responsible player, not necessarily one who is by trade a defender. I might point to City's use of Mateus Nunes as a full back. Or Liverpool's with Szoboszlai.
- The best form of defence is often attack, or at the very least ball retention. Dalot is quite limited on the ball. Not bad, but limited. Mount offers a massive upgrade in this area.
- Defence wins titles, but goals win games. We aren't winning any titles, but we should start getting in the habit of winning games, and to do that you need to score goals. Against Liverpool alone, Dalot had the ball come to him twice in the Liverpool area with a really good chance to shoot first time, or bring it down and bring others into play. In their penalty area, and not as part of a set piece but as a part of general build up play. Both times he fluffed his lines badly. If those moments had fallen to Mount, we very easily could have been 2 up.
- Watching the positions Dalot takes up in the majority of matches, you would be easily forgiven for wondering why a defender needs to be played in that role.
- It wouldn't be the right approach in every game. Famously Fergie would often tinker his tactics with minor but fundamental tweaks according to the opposition. One of those was instructing full backs to stay at home when playing in tight away games against tough opposition. Maybe only giving them the green light to overlap when chasing the game or seeking a winner. So there is cause for saying there are games where you'd want to pick a defender in that role and go for increased defensive solidity. Conversely however, there are also arguments to be made that in games where you are expecting to be dominant with the ball, and higher up the pitch, it's inherently self limiting to play a full back in a role that will essentially manifest as an inverted left midfielder/winger.
- Diallo is the obvious example of how the role could and should be played, and consequently how dangerous we often look down the right. Doing the same on the left seems logical to me. One of the criticisms I have of Amorim is his seeming unwillingness to take more risks with his selections. Shuffling either Mount to the left sided slot, so he can support the attack properly, or tuck into the midfield to create overloads - or Bruno to do the same thing (with Mainoo coming into midfield) are two very logical, if slightly unorthodox moves, that I think would make us a lot better in certain games. The entire system is unorthodox, hence why it gets so much attention, so the dogmatic selections are often quite frustrating to me.
- This entire thought train is based on the actual positions and functions both the eye test and the data tell us players are actually performing during matches. None of it fits if we get bogged down in nomenclature. Mount or Bruno as a left wingback sounds mental. IF they were orthodox wingbacks, but they aren't. We are playing a right footed right back at left wingback with instructions to come inside, get into the attacking third, and support the midfield. So why not play an actual right footed, hard working, midfielder there in matches where you expect to have most of the ball?
- The dynamic that could be formed with Cunha is one that I salivate at.
Many good arguments there, and you make a plausibly sounding case. If I should put into words why I don’t expect to see it except in cases of goose chases or injury conundrums, I would focus more on what Mount is actually good at and not so good, and what the team needs looking at he other players in there.
Mount is a good presser in the sense that he is disciplined and has stamina, he will press and understand how and when to press. He is a weak presser in the sense that if someone decides to try to pass him by dribling, one-two’s or sprinting past, he neither has the strength, the explosivity nor the defensive instincts to stop that player if he is any good at it. Looking at United’s current roles, his pressing profile suits the three attacking roles very well, because CB’s don’t tend to try to dribble, outsprint or combine past press, so it’s enough being at the right place at the right time and don’t sell yourself. However, I’d argue that at CM, and even more at WB, you need to be able to stop these players who will take risks, and who have the strengths to get past players. I think Mount have struggled in midfield due to this, and I suspect he’ll struggle even more at WB.
If United had Baleba inside of him and Van Disj behind him, I think the risk would be a lot less. But we have a halfway house version of Shaw behind and a Bruno on the inside who has the same defensive weaknesses and on top of that lacks the defensive positional discipline of Mount.
To me it says a lot that a couple of coaches now have tried Mount in CM and opted for Bruno there ahead of him. It also speaks volumes to me that the worst version of Dalot I can remember seeing is preferred ahead of him at his second best side, LWB every single time, whereas The slight (but more explosive, and therefore harder to bypass) Amad already is being used there at Anfield. Mount is being used in a position were he competes with our two new stars, Amad, Mainoo, Bruno and Zirkzee, while he is not used in positions where we are lacking the most both in quality and quantity (WB and CM). No coincidence, and I don’t think it’s because nobody has thought of it.
A final argument is that for me, it dampens some of Mounts biggest strengths - being able to read positions and space quickly in the condensed areas that our no 10 are expected to thrive in. Even Dorgu can read the main movement patterns for a WB under Amorim, but the demand on the no 10 position, often tucked right into the central crowded areas, is were Mount actually goes above any player we have with the exception of Bruno. This would be somewhat wasted in the WB positions, where psotioning is simpler, and need for explosivity to get past players 1-v-1 is bigger (not Mount’s strength).
Again, if United had Baleba and Van Dijk at LCM and LCB, and I could think almost exclusively of the attacking need from the LWB position, I might prefer Mount there ahead of Dorgu for some games and not for others. Right now, I’d preferred a lamp post ahead of Dalot in any position on the field, and that Mount sits on the bench seeing him play LWB just tells me that noone at Utd even veaguely considers the formation you suggested as a starting line up. IMO