sup3rrn0va

So i'm sure this has already been said by someone somewhere upon the forums but has anyone considered both of Chief and the mystery spartan working like the Halo 2 Campaign system. Where as you would play maybe a mission or 2 as chief and then maybe switch over too the other spartan and repeat until their paths collide. Just an idea to throw out there. Not sure what to speculate on the silver spartan. Maybe he is looking to bring chief back if chief went rouge maybe he has a completely different goal or maybe he is out to kill chief. So many questions but im sure some of them will be answered at E3 discuss on here freely!