Well one thing is for sure - there are players who are currently playing well that will drift off under the new guy and vice versa. It happens all the time.
Based on the way some of you think, the likes of Lennon would have been sold as soon as harry came in because he barely featured under Ramos and likewise for Drogba who looked out of sorts under Scolari and is the best striker in the world under ancellotti.
Lets just see how we fair under the new system. Its unlikely, granted, but we could have the best defense in the league post christmas.... using all or nealry all of the players we already have here.