Since amaterasu seems to be a hot topic, I will list the ways Jiraiya can counter it.
-Fire sealing scroll (situational obviously)
-Needle Jizo
-Frog summons to be used as meat shields (not in character but works regardless)
-Kage bunshins
-Substitution jutsu
-Dust cloud from Ma (SM only)
-Stay out of Amaterasu's range
-Smoke bombs
-he cant seal the flames when his hands are on fire. he needs to write the seals.
- needle jizo covers his body but not his face
- they're too big and lack enough speed to jump in his path and j-man would never sacrifice his toads
- he never uses kage bunshins against top people. he never has once.
- substitution jutsu = same thing as clones basically. he's never used that against top tiers either.
- it takes jiraiya a long time to enter sm. why wouldnt itachi pull out ama before then to avoid his transformation? even if he does sharingan can see chakra and he'll still know where to aim ama.
-yes. but he has no idea what ama is, so what are the odds he will? itachi has shown great shunshin feats. it wont be hard to close distance.
- no. sharingan sees through that since it can see the color of chakra. when has jiraiya used smoke bombs against top ppl again?
if we're going along by saying substitution jutsu and clones avoid ama by someone who rarely uses it then basic shinobi should be able to surpass kamui by using the same
the point is surprise. minato wouldn't of been able to beat obito with a substitution jutsu or a clone when obito started using kamui bc obito surprised him. itachi can do the same to jiraiya. the only difference in this scenario is that minato had ftg to counter kamui but jiraiya has no actual counter to itachi's ama.