Monreal improving and an extra game for the back 4 to gel are legit claims, but I'd still rest him. I'd also rest Caz, but I don't think Wenger will. Theo probably spent more energy than ever before, and Perez (and Ox) are there - but if he insists he wants to play "coz he's in da mood", I'd probably let him. All (bar Nacho) are things only the boss can really call. But we should definitely take this very seriously, and try to win it early.