I tried to look for this kind of Q&A, but Naruto tag is very big. I'm trying to figure out if this is a plot hole (aka Kishimoto didn't thought this far) or misunderstanding by me. If I remember right, in Naruto Shippuden there's a realization that the Kage Bunshin retrieve the information they learn to the original use. If I'm not wrong Naruto used this in the battle against Pain, he putted his bunshin over the summoned frogs world to build up...
Originally asked by USerNAme on Stack Exchange (anime) (CC BY-SA 4.0).
Variant 92.
Variant 197.