Hearing that, I suppose Wenger is pointing out Walcott's off the ball qualities. He make good runs, not only behind the backline, to the wide areas as well and that's how and why, with Fabregas in the side, will Arsene run the business. He's a forward already, he understands the role he was given and effective, scoring trademark goals. Imagine Cesc looking for passes from deep areas and Walcott sneaking, just like Vela's goal yesterday. When he's in, and in form, RVP's false nine game might be less fruitful with that way. This 4-3-3, though, works amazingly well. Rosicky's deeper role is mostly because of his tension to do so, but also I think one of the wingers drops a little bit when other pushing, I'm not really sure if It's because Walcott's bright start, need to check this some time.

Cheers.