Hmmm, still a previous chapter implied that Jiraiya had a choice to make, and we have yet to see the outcome of that choice. I have no doubt that Jiraiya is a goner, but I think he may have a few more lines in the next chapter before he is finished off. We may get some sort of explanation.

Also, in reference to the toad sage's claim that Jiraiya will "write a book," do you think that was referring to the adult novels he published? Or could it be a metaphor for something else? Maybe it's a suggestion that Jiraiya somehow "wrote" the fate of "Pain".

Just an idea.