To be honest this argueing is a little irrelevant as moving the mirror back inboard will have a tiny effect on the car in my opinion. If this was before 2009 though, it would have made a big difference as all the little aero parts on the sidepods would have been optimised on being downstream of the mirrors.
Just my opinion anyway.
Also with regard to the bigger than normal holes for starters in the diffusers, my understanding was that they were leagal, hence passed scrutineering and were allowed to race for bahrain but were then modified based on unanimous agreement between the 4 teams and the FIA that they may not be in the interest of the rules. And to be honest, looking at the current Mclaren diffuser, they bearly changed it at all!