Not getting all this 'Rashford was poor against PSG' talk. Yes, he made a weak effort for one key chance but he also produced more attacking play that any other United player. He had Kehrer on toast, effortlessly, every time we were able to actually get the ball to him.
That said, I don't know if I see them as a partnership. Lukaku just keeps scoring so it's hard to leave him out but I still find the 'front four' of Pogba, Martial, Lingard and Rashford more dangerous and better to watch.
The thing about Rashford up front vs Rashford on the wing is this: imagine every time he skins his defender on the wing, which these days seems to be every time he tries, it's actually a CB and that then puts him clean through on goal. Lethal. Whereas from a wide position he produces his best skill to beat the first man but still has so much to do to turn that into a goalscoring opportunity.