Glad to see posts like these. He is being given too much to do and without a connective partner to ping balls back and fro with, there's a massive problem for him from the outset.
He's also got a sizeable issue with his stamina in the adult game and a really simple solution to dealing with him is just running him until he gasses, which is when he looks laggy and slower than he initially started the game. It's the manager's job to prevent these things from happening instead of tasking anyone with that role that is more set up for failure than success. Far, far better midfield units than ours ensure that no one player is isolated or ran at all game, either by controlling the midfield outright, or by filling it with able bodies who make pressuring any one player, or even getting clean runs, incredibly difficult. We do not a single thing right in support of the single pivot, and as someone said above, there's a concern that can lead to ruining the player as the load should never ever be as much as we stack. As someone else said, it doesn't matter who is in that role, it's a thankless task that sets the stage for failure; even a routine pass for other midfield #6's is death defying in this set up because the next closest midfielder to balls gone astray is nowhere to be seen.
Smart coaches know to swarm and this will be a theme for the remainder of the season, whether the kid can play through that most of the time isn't relevant; what is is that the times he can't or fails to do so, the set up has us in almost perilous danger from the moment the mistake is made. It's a shambolic way to run a midfield and the caveat should be there in assessment of Mainoo.