Yes he does seem capable of that. Although we copped a hiding at Liverpool so it didn't work out too well that day!
The home victories against Spurs and Chelsea and the draw against Liverpool were probably our best performances of the season, and from memory I believe we used 3 different formations in those games. A back 3 against Liverpool and Spurs but with different set-ups in midfield, and a back 4 against Chelsea last week, with Ramsey as a 10 and two strikers ahead of him.
Overall Emery seems to be very good at preparing teams for big games in particular (with the odd slip). His Sevilla side battered a much-fancied Liverpool in the Europa League final a cupla years back. They had the big win against Barca when he was at PSG (followed by the dramatic reverse in the 2nd leg). He's actually got a great record in finals too. And then at Arsenal he's done similar - the Spurs and Chelsea wins at home were somewhat unexpected. Although we had a bit of a streak going into Spurs we hadn't played the house down, it was clearly our best performance of the season. And the Chelsea win was excellent last week despite poor form going into it (lost to Westham the week prior).
So I'm feeling confident in that respect, but I'm worried about how good ManU might be. I haven't been watching you guys really, but from everything I've read it seems you're absolutely storming.