Arteta wants all his defenders to be good enough on the ball that they could play DM, but that doesn't mean he's going to play them at DM. Lisandro Martinez played some DM at Ajax, Zinchenko obviously played a lot in midfield. White had a few games, Tomiyasu played DM in Japan according to transfermarkt. Kiwior, obviously. I'd like to see what he could do in the Zinchenko role.