He'll play alongside Arteta in a 2 man CM pairing, with Santi Cazorla playing ahead of them as an attacking midfielder. We play a 4-2-3-1. He will share defensive responsibilities with Arteta. He's a deep lying playmaker, so he'd probably prefer playing alongside a destroyer, but he'll have to settle with sharing defensive responsibilities with Arteta.
It might be a little too soft when we play against teams that will actually attack us, but most who watch the EPL will tell you that 80% of the teams park the bus, sit back and hope for a goal from a set piece.
It was why Gilberto was absolutely useless for us in 80% of the games in the league, but he was amazing in the CL.