True power of Jiraiya

[Gein]

J-Man is one of the strongest ninja in history.

and look at the students he produced

1. Nagato ~ A beast with out any question. Leader of Akatsuki, Rinnegan user, Mastered all chakra natures by the age of 10.
2. Yahiko ~ Yahiko was never portrayed well, Assuming he is a excellent suiton user
3. Konan ~ A very strong Kunoichi who was even able to injure obito and even force him on using izanagi
4. Minato ~ Earned the title of Yellow flash. Hokage
5. Naruto ~ A Monstrous beast. Calls all nine tailed beasts by their name and plays with them and also the reincarnation of Ashura. Hokage Candidate.

Indeed
Everything about Jiraiya is just legendary. Past and future.
His senseis and his students could be considered virtually unstoppable.(Only plot won)

 

[Espadara Uchiha]

I agree with all these points. Also, Jiraiya wrote Icha Icha and presumably still has the ability to reproduce. That an instant + in badass factor.