I think he'll be the most impacted by going back to a 4231 type. Depends how Ole/Fletcher see him and the other wingers but I doubt see him as the first sub off the bench now either. Mbeumo, Sesko and Amad the starting front 3, Cunha the first attacking sub, mainoo competing with Ugarte for the deeper role next to Casemiro. Leaves Mount to be the 2nd winger sub which isn't his best role, or the odd rest for Bruno.
I'd 100% sell him if we could get decent money. He's a good player, but he's too fragile and doesn't really fit. In the event Bruno leaves you could argue we need him, but I also don't think he's that type of 10 to run games, he tends to hide from the ball a bit. He played 30 minutes compared to Mainoos 15, yet he 12 passes compared to Mainoos 19. He just doesn't get involved enough in games which you can't do in a key position like that.