Moyes won't drop Fellaini back IMO and neither should he. All our good form in the last 9 months has come with Fellaini higher up the pitch and even at Villa and WBA we fell apart when he went deeper.
I don't know we're the myth has come from that it's his best position either. He never played there for Standard, he doesn't play there for Belgium and he's now looking a really top class player since he's been pushed into what his is best position by us.
He's a very good player but defensively, he's just not as good, he doesn't track runners and doesn't have the discipline for the deeper role. Add in the fact that it's a waste of his talent him being there then I can confidently say I doubt very much we'll see him starting many games in that position.
It will be Neville there, all those clutching at straws putting Fellaini in there are doing so more in hope as Neville and Osman will play in Gibsons absence.