No one denies that jiray DID A LOT..im just saying he failed in showing us how he improved naruto at any large scale in the early part two
oh, but he was very essential in narutos' development, here's a list
- taught naruto chakra proper chakra control
- taught naruto the rasengan, which is the basis of all jutsu naruto uses, his rasen shurken, oodama rasengan, planetary, are all upgrades of base rasengan. and without base rasengan, they wud all be impossible
- still on the rasengan, bcos of the rasengan, naruto is able to use the ultimate jutsu of the tailed besat- TBB
- all the talk no jutsu naruto uses on his opponentes to bring convince them and bring them to the light i.e nagato. jiraiya is the inspiration and foundation for all that talk
- naruto is the character he his today bcos of jiraiya
so jiraiya did play a big part in narutos' development. but really, i dont see why u shud base a characters' usefulness on the effects he/she had on the development of another character, just saying. naruto improvement or not, jiraiya was a boss, and was useful. nuff said