I think it's the type of #10 he wants. He seems to want a mix of Özil and Ramsey I think.I mean I don’t personally care if fans are digging him out. If Emery valued him that’d be all that mattered.
Fans are idiots as evidenced by the AMN and Iwobi abuse.
As for the number ten role I’m not sure Emery wants one long term, he hasn’t bothered playing Özil there when he is a number 10 through and through.