You've just proved my point. You don't expect it from Davies, because he's not that type of player. Neither is Gylfi, but because of his fee (which we overpaid on) you are expecting him to do so.
What successful side in England currently has the player who controls their game playing in a no.10 role in a 4-2-3-1, C?
Because Liverpool don't. Arsenal don't (they don't really have anyone, tbf), Spurs don't (Alli plays that role, Eriksen usually plays wider). Chelsea play a 4-3-3 now. United - well I don't really know what they do tbf. City play 4-3-3.
The game's moved on from that player 'in the hole' dictating the play. The role of that player in my book - in a system like Silva wants to play - is link the play in the final third and create chances there. It's why I always preferred Ross deeper in the Martinez years, as he could actually drive us forward from deep.
This is not an excuse for Gylfi not to do the minimum btw. He should get on the ball and help us craft moves together - which he has been doing, and he was key in both of our goals. Needs to keep that up.