In many ways, last nights result and performance haven't helped Mourinho. He talked openly about 'having to play a different way' without Lukaku. Well, that way looked much, much better. And he's kind of admitted that it happened because it was forced on him. He'd have been better (for himself) saying that the performance was no different than other recent games that we've dropped points in, it just cut out the defensive mistakes. It'd have been bollocks, but that doesn't normally stop him.
It was only Everton, but the manner of the performance in the second half showed how we should be playing. Martial central, Lingard just off him, Pogba advanced with 2 midfielders behind him. You could make changes on the right, and probably put Bailly and Valencia in for Jones and Lindelof, but otherwise that looks to be our strongest team and certainly the best way of playing. In fact, all of our best performances this season have incorporated Martial and Lingard playing more centrally, and Pogba playing in a more advanced position.
So, what does he do when Lukaku is back? United fans have had a glimpse at the alternative, so if he reverts to type and the football's shit, the pressure will crank up further.
Personally, I'd try Lukaku on the right for a bit. Not his natural position, but cutting in on his left, and getting into the box to attack crosses from Shaw/Young on the left could be a decent weapon. In any event, Martial, Lingard and Pobga. Get those 3 in their best positions and keep them there.