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Pains summons.
Not the same jutsu.. the one used on nagato's pain was
Magen: Gama Rinshō
The one used on those summons are Senpō: Kawazu Naki, not genjutsu just soundwaves
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Pains summons.
I do. That's how Jutsu works. Molding Chakra according to the technique that wants to be used, then it activates. Exceptions are time delayed Jutsu like Zetsu's spore technique. Other than that, I don't see any requirements. What should he have prepared beforehand? It's just like Izanagi, Koto Amatsukami or Tsukuyomi - they don't need any preparation aside from the conditions they are used under, for example eye contact.You speak as if izanami needs to be used right after its been prepared. It doesn't.
On top of this the frogs also provide infinite sage mode while charging on your shoulders and it allows you to keep fighting - the only issue with it is the time it takes to charge. I will say Izanami is extremely powerful but not on the level on the frog song.You don't need SM for frog song, one only need to summon ma and pa and it can be used.
Frog song also doesn't have the downside of losing an eye.
It seems that flashbacks is a person speaking. Like when Tsunade was having a flashback while talking to Orochimaru and Kabuto while she was crying. It was a real time event and they sat and listened to her.
I tend to think that Kabtuo's flashback was a real time event in which he explained his life to the Uchiha brothers. And they for the most part were listening to it.