Yeah, I think he recognized the body Pein was using when he was first introduced which resembles Yahiko. I don't know if Yahiko is Pein because that would require some marvelously imaginative explanation that being said I wouldn't put it beyond Kishimoto. That is a recurring thing in Naruto just when you think you know Kishi proves to you, you don't.

Quote Originally Posted by kAi
Man, now Jiraiya has lost his arm, it's still not the end of him, he can survive this with his own power. Defeating Pein at this point doesn't seem to feasible, but getting a good hit on him and escaping seems like a way to get past this, or am I just too trusting and saying this because I don't want Jiraiya to die?

There are many things that are unbelievable. Also, did Pein need to summon the other bodies or could they just arrive on their own when needed? Or it is possible that they weren't completely dead and he did some type of one handed seal maybe when lying on the ground with a sword through his chest, as he did say "argh". Not sure, just giving possible theories of how he got out of it.
I think you just want Jiraiya to survive. I thought that all six being there was completely unnecessary as well but maybe Pein is going to do the typical villain thing and give a nice speech and spell out all his strengths and weaknesses etc before he kills Jiraiya. At this point absolutely anything is possible.