Board Thread:Theories and Speculation/@comment-32617252-20180505055143/@comment-142748-20180607040959

Naruto wasn't weaker than his teenage self. He was far stronger, had a completed Kurama inside him, and was shown he still trained a lot. He was never called weaker either, his battle senses had just gotten rusty.

Momoshiki was stronger than Kaguya and that was even before consuming Kinshiki. Kaguya was making the Zetsu army SOLELY to try to stave them off or defeat them. Yet...adult Naruto and Sasuke were able to kick Momoshiki's ass even after absorbing Kinshiki without even using ninjutsu.