Regardless of what position he ends up in, he just looks like a top footballer in the making. The most encouraging thing for me is after he makes an error (and he has made a few big ones), his confidence doesn't seem to take a hit. In terms of style, it's nothing extreme so you get the feeling he could play equally well with Koscielny or Mertesacker, which is perfect from our perspective.
With a lot of players starting slowly, I think our best XI for the next few weeks involves Chambers. Just a shame for him that he has to break into the strongest CB pairing in the league. Debuchy has started pretty well so I don't think he gets in there until there's an injury. DM position is open but perhaps too much of a risk for Wenger. He'd get a lot of criticism if that backfired.