Board Thread:Versus Debates/@comment-26958911-20151010214426/@comment-25122992-20160104165535

As I already stated, Itachi would do everything he can to stop the toads from completing the jutsu, and nothing suggests he cannot succed in this, anyway he must be trapped in genjutsu to be "surprised by it's power". Itachi is smart enough to make no prejudices about his opponents' abilities and speciality (unlike Nagato, he wasn't his student + has some knowledge about senjutsu), although he always takes them into account too, and considering his experience in genjutsu, which exceeds the experience of any other character (probably, aside from Shisui), as well as the skills, he'd find the way to prevent/resist the genjutsu. Besides, to use Toad Chant, Jiraya has to activate his SM and summon Ma/Pa at first, during this time he's even more vunerable than in case above, so there's no guarantee he succeeds in this too.