It depends what you look for in a Centre Midfielder. I don't agree he has all the attributes. He has some of the attributes.
He's neat and tidy in possession but he's fairly negative. A lot of sideways and backwards passing. You are right what you say where that can compliment Hackney as Hackney can be the driving force forward but wouldn't it be nice to have two players in midfield who can drive us forward.
He offers very little out of possession. He doesn't hit tackles, he doesn't get in opponents faces. He has no physical presence. Ideally we would want out second midfielder doing that alongside Hackney. O'Brien would offer this I think.
I think he does a job in matches where we are dominating possession. He helps us recycle the ball and keeps it moving. He's far from a complete midfielder though.