Im only stating a fact. Itachi said that even more backup wouldnt change outcome of battle. So Im asking you: do you really believe that Jiraiya can take on Itachi, Kisame and lets say Sasori and Deidara and win? I dont think so, considering that Itachi alone has technique that is OHKO for Jiraiya (Amaterasu). When one kage-level shinobi faces four kage-level shinobis the outcome of battle is very clear. Itachi was simply overstating Jiraiyas strenght.
first off, don't compare sasuke ability with itachi' 2 diff thing's
Sasuke tamed Manda via genjutsu, and Itachi is superior in that apsect when you compare him to his younger bother.
2. don't slander the 2 elder frog-they are "SAGE" not idiot's, also they are
GEN JUTSU SPECAILIST
Just like Manda is no ordinary snake. So what id they are gen-specialist? So is Kurenai or Shii, yet genjutsu worked just fine on them. Genjutsu masters sre not immune to genjutsu, unless they have Sharingan, that is.
in sage mode jiraiya is fast in his hand seal's for jutsu
To seal Amaterasu Jiraiya had to:
1. Pull out the scroll
2. Kneel on the ground with scroll
3. Write sealing formula on it
4. And only then he was able to seal Amaterasu. Something like that is simple impossible to do during combat, let alone when you are facing Amaterasu.