In Emery's mind, it's Onana, Bogarde or Kamara in that slightly deeper position, and I think that's about right. Dougie's a pretty ineffective tackler.
Bogarde's distribution was conspicuously poor on two occasions last night, including one just after he came on. Other than that, he was fine in his role sitting at the base and niggling the opposition when we didn't have possession. He's just not as good (yet) at it as Onana, who is, as a reminder, a £50m player heading to the WC as first pick midfielder with a top ten ranked nation.