Irvine seems very keen to have 3 centre backs as an option. If the 2 wing backs are expected to play deep that's a very defensive set up, unless you are going to dispense with the deep lying midfielder.
You need 5 attacking players if you are going to take the game to the opposition, which at home I would have thought was a must. Otherwise you are inviting pressure onto you.
I hope also there is no complacency with Saturday's performance in terms of, the current squad will do. If Saido gets injured or more likely, has a dip in form, we need other attacking options. I think we may regret getting rid of Amalfitano, unless we are about to bring in an attacking widemen, who is better. It looks like they are still scratching around trying to find someone. Otherwise the team is going to be too narrow. It's fine saying the wing backs will get forward, but are they then also expected to play as full backs?