#1 Contrast
Sanchez's most recent game for United was the 1-1 draw at home to Wolverhampton Wanderers. And again, his performance referenced this stark contrast. People can speculate what the exact cause of it is.
But in a way, it's sad to see what has been one of the Premier League's top players in recent times to descend in his quality and output.
Can he regain it? Yes. But he and Mourinho need to do much soul-searching to recover his form.
Could he go back to Arsenal? Wenger has gone, and it's evident that the attitude under him will evaporate too, now that Emery is the head coach. A player of his style could do well under Emery's pressing game, and Arsenal does need a wide forward.
OK, that's fanciful, but talk of him leaving at this point is moot at best. He needs more time to bed in, but for United and his sakes, he needs to recover the Arsenal form.
Arguably Sanchez's best ever performance in England was, ironically, against Man United. It would be good if only based on his apparent talent, for him to re-capture this.