Actually it could be some past Body he has used to maintain himself alive inside of a body, like when they show on the past when he burned down some village he still had Akatsuki clothes which this occured when he defeated Hanzou.
Even though he still was in Peins currently body, but we'll find all this mess out later
pein, robot ninja from the future sent back to change things ,,,,,,,, lol /jp
i think pein might be like sosari but with a weaker ninjutsu
I could possibly be quite wrong but havnt they captured 6 of the 9 bijus
i think pein uses the bodies like the time itachi and kisame uses other bodies to fight guy's team and kakashi's. I think hes gonna use that technique to fight jiraiya and measure his strenght
its likely that he used each bodies for different reasons.
the thing that bothered me the most was which body is the real pain, is it the one we saw the 1st time or maybe the one we haven't see..
My English sucks
could the rings play some role in his different bodies maybe it is the ring that everyone wears which allows this