Wow, this was a nice chapter.
To finally hear how the Sannin came to be.. Or their title more like.
But Pein is that strong? Strong enough to kill the guy that gave them the title in the first place? That's insane. Up to this point, I can finally understand how and what they mean when they say weak, they mean weak. Kinda makes me question Yondaime's strength with all this in mind. And it should be obvious I'm worried for Jiraiya.
I don't know. Pein definately is living up to expectation.