Is Choji in war arc version? If so, him and Shikamaru might be quite troublesome for Jiraiya. Choji was holding off Gedo Mazo on his own, he can surely take down some of Jiraiyaβs summonings by himself.
Sage Mode might not be enough to tank Human Yo-Yo technique. Jiraiya surely will have to go for his higher end techniques to pull off a win, but it is not guaranteed imo.