What I would give to have him play #9 in a 4-3-3 and build an actual functioning team behind him.
He hasn’t done this anywhere. Not here, not at Madrid. From what I gather he doesn’t want to play #9. And his performances when for Real in the position were poor anyways. He demands absolute freedom on the pitch. So unless you have a coach with the force of will to bench him if he doesn’t stay central and play the #9 role, not sure what you’re going to do with him, even if you put him in the role. But I definitely agree, he shouldn’t be playing as a winger in a 4-3-3 anymore.
Most likely fix, that allows him his freedom would be a 4-4-2, and with a functioning midfield pair that could work well, Chiesa on the one flank, Kulu/better player on the other. When Morata’s in form, he’d be perfect beside Ronaldo in that 4-4-2. Unfortunately he’s too unreliable. I would be curious to see something like:
Cuadrado-Demiral-De Ligt-Gosens
Chiesa-Locatelli-Aouar-Kulu replacement
Morata-Ronaldo
unfortunately there is no way we sign Locatelli, Aouar, Gosens, and a Kulu replacement this summer. So moot point, I guess.