RocktheCasbah
I think this is the key point. People pointing to the Rashford game forget that was an Arsenal team that accumulated 71 points and finished 5 points ahead of United. For context, we're currently 29 points ahead of United.
The only caveat is they've drawn to Liverpool twice in recent weeks and this is the sort of game that suits them, because there's no onus on them to play a high line or attack, they can just repeatedly spam Bruno and Rashford/Garnacho.