I imagine jiraiya is going to teach naruto something otherwise he wouldn't have bothered taking naruto on the trip, cuz naruto's definate not there to keep jiraiya company. As far as it being better than the chidori, that's entirely possible seeing as he got the summon at the same time as sasuke got the chidori, and the summon is just better. It might also just be that the technique is only better than the chidori in the sense that it's better for NARUTO than the chidori is.