Madara would've killed them... It's Kishimoto's fault, he had to speed things up.... Even his own quotes about Madara being a perfect being came to bite him in the ass.... Feats don't matter when the direction of the manga twists in such a way where Kishimoto's own testimony & sudden plot changes and immediate retcons take place in a contradictory fashion where an outside source had to intervene to properly explain how Madara could reasonable be defeated. In the end of the day, Madara wasn't defeated by Naruto and Sasuke && the battle was still falling in Madara's favor, only thing that Madara couldn't account for was the bs that Black Zetsu pulled. Knowledge & experience made a world of a difference which Kaguya had NEITHER of which made her an infinitely easier target even though she OUTPOWERS Madara easily.
So you've literally given no reasons other than asserting "madara would have killed them" as to why madara would have killed them.
You completely ignored everything that i've brought to the table about how Kishi had madara get hits lights beaten out by Gai, thrashed by base naruto, sliced in half, and forced to run away from sasuke. Then of course he gets fisted and genderbent by black zetsu.
So you've already conceded this argument as you've been forced to ignore my own arguments and all you've done is simply assert what you're trying to prove as true without any reason.
If kishi has madara getting thrashed around like that, then there's absolutely no reason why he can't have naruto and sasuke beat madara in a fight, especially when naruto and sasuke's powers haven't even been shown. If Madara is written as X powerful, he just makes naruto and sasuke X +1 powerful and they win.
The battle was absolutely not falling in madara's favor, he used chibaku tensei and MT, both got easily countered by naruto and sauske, the former of the duo not using a fraction of what he's capable of.
As far as kaguya goes, she has black zetsu who's infinitely more knowledgeable and experienced than madara ever was as he's been around since indra and asura's days, and he's the very one who played madara like a puppet. If Madara for some reason was above kaguya due to knowledge or experience, the manga would have made that clear, yet it didn't even so much as HINT at that.
Also, kishi's quotes about madara being perfect were aimed at EDO MADARA. Unless you want to assert that Kaguya, juubidara, juubito, Naruto, and Sasuke are below edo madara, then no, those statements no longer apply to the manga and its current power levels.