He very much is a defensive mid. Defensive mids do not just have to sit however, just because the greatest one (Maka) played his game like that doesn't mean that's how all DMs play. They screen the defence and win the ball, when our team is in posession then of course there's a license to push forward. Even Mikel does push forward and he's the most defensive DM alive. Busquets does it, he's probably the best in the world at what he does, Khedira does it. It's hard to think of any player who just sits.