We've had all 3 fit all season and the best one didn't get a chance until Gervais fucked off to Africa.
Obviously there's nothing wrong in having 3 good players for 2 positions. We have 1 good player and 2 [insert appropriate adjective] players for 2 positions. But no matter who we think is the better choice out of Theo and Gerv (and most seem to think it's Gerv), Wenger will sooner drop Oxlade than Theo - that is the truth.