Do you have evidence that momoshiki was kaguyas retainer?
Because now that i think about it, sasuke did stated there was someone more terrifying then kaguya and thats why she was creating the zetsus army.
And then latter in boruto movie sasuke confirmed that those where the same people, so where is your evidence?
Also you are using example of hashirama being hit unguarded by a sword to momoshiki even through he was pretty much with his guard up when he attacked agains't that rasengan...?
Also i am pretty shure he already explained about the durability stuff and that depending of your power level you can tank stuff too you should re-read the thread again i hope...
he wasnt able to defeat alone momoshiki because he had his chakra sucked out for gods know how long, had to use his chakra to stop a veeeery powerfull attack and wasn't using all the bijus chakra (you would have known about this if you had saw michael's thread explaining it i think it was a pretty good one, dispise him being a fan boy)
It was stated either in a novel or some kind of guide. Don't feel like finding it now though nor is this needed to prove my point. Momoshiki and Kinshiki being a great threat doesn't change the fact that their feats aren't on Kaguya's level nor does it necessarily mean that they are stronger. It means that they are bigger threat and that's due to their abilities.
This isn't Dragon Ball Z. Like I said, Hashirama's chakra is the strongest of the Non Rikudo characters and he's the strongest Shinobi outside of them yet a Kunai can kill him. Not sure what you are talking about with the first bold but Momoshiki having his guard up doesn't change the fact that he has no defensive technique.
-Hashirama w/o a defensive technique gets killed by a Kunai. Does that mean that anyone with a Kunai>Hashirama?
-Madara w/o Susanoo would be killed by Tsunade's punch if it landed a direct hit. Does this mean Tsunade is on Madara's level? No.
-Momoshki w/o a defensive technique gets killed by a Rasengan fueled by Base Naruto's power. Does that mean Base Naruto>Momoshiki now? :lol I hope not considering Naruto canonically can't win on his own even when using Kurama Mode.
Momoshiki attacked Konoha at the beginning of the movie, and to counter Momoshiki's attack Naruto basically had to sacrifice himself. If he could've beaten Momoshiki then, he would've instead of letting himself get captured. The chakra thing isn't an excuse. After he was saved he got enough power from Kurama to enter Kurama Mode and he still needed Sasuke's help.