In the past 2 games he has. When the other team had the ball, he left closing down players in front of the box to Matic/Luiz and Lamps and he stayed most of the time inside the box. Luiz plays similar when he's at DM, but Mikel took it to a more extreme level. It really felt like we had a back 5. (not complaining about it, just wanted to point it out)