Trouble is who do you leave out for Root, Strauss who could probably do with being involved in the WI series or Cook? I can't see Root playing to be honest, I think it's probably a season to soon for him, and I really don't see someone like Carberry coming in as that would go against what this England team want to do by building for the future. I just can't see any of the top 3 being told to make way for someone new. Strauss isn't even playing badly right now, he just seems to be making bad decisions that gets him out.
I would hand a new cap out at 6 and maybe say to KP, look you've been at the IPL, play a couple of championship matches for Surrey to get back into the longer format of the game and we'll see you for SA.