I was just wondering to myself that Pein said he would have lost if Jiraiya had known his secret. Now I just wonder what kind of secret could it have been that would have changed the battle to Jiraiya's favor which seemed unlikely.
Could it be if you say my real name then the real me appears? lol
or is it more likely
that it had to do with the summoning and how to destroy a body because then he defeats 3 bodies and only had to fight 3 more instead of the 6?