I'd be surprised if we switched to a back 4; once we settled last season, we were pretty solid playing a 5.
I'm not convinced by Wright in midfield though, particularly where Croasdale plays, as that would mean leaving him out. We don't do well when Croasdale's out of the team, as we saw last season and are seeing again so far.
We could play both and have two CDMs and then Powell ahead but I'd see that as unlikely too if we stick to a 5 at the back. It's just too defensive at that point.