It would be enough but the way I see it is actually like this:
New GK, new RB, new CB/LB, new RM/AM (Nakamura?/Koumas?/Sneijder?), new DM (Reo-Coker?), new ST.
So 6 players coming in overall with Davis, Ridgewell, Sutton, Djemba x2, McCann, Hendrie, Delaney/Hughes and a goalkeeper leaving. 8 out, 6 in but a much stronger and deeper squad all the same.