I usually just read threads and refrain from posting, but to understand who could survive you have to specify what time. Naruto and Sasuke that fought Madara during the 4th War. Dead. Madara would of been dead, if he didn't have his power-up. Kaguya had more chakra but was no where near as powerful as Madara. Sort of like a 600lb man, yeah he carries a lot of weight but it's more of a downfall than a benefit. Madara was like a 450lb all muscle. Naruto and Sasuke were 275lb muscle man at that time. Might Guy, must be evaluated accordingly. He's far superior in brute force combat, more so than any other ninja ever. His Taijutsu before gates is lethal. Guy alone is a 200lb muscle man, absolutely no fat. Gates pushes him to being 325lb muscle man, no fat on a extremely skilled, if not the best hand to hand fighter in the Naruto universe. Now lets talk about what power really is; Madara can hone his 350lbs into a 1 square inch point of contact, call 350 to 1. Naruto and Sasuke can take their 275 into a 1.5in point of contact, their power comes from their ability to become like one multiplying their benefit. Together, Naruto and Sasuke make a 550lb fighter with .75 sq in. point of contact. Now as for Might Guy with gates. He's a 325lb fighter hitting a focal point of about .5 sq in. point of contact.
Madara 450 to 1 (seemingly Invincible, still able to move freely, grows new legs. Invincible until he meets Kaguya's resurrection requirements)
Sasuke 275 to 1 (Lost arm after Naruto fight, not invincible)
Naruto 275 to 1 (Lost arm after Sasuke fight, not invincible)
NaruSasu 625 to 1 (Invincible)
Might Guy (Gates) 650 to 1 (Then dies.)
Things that needed to be understood.
The attack wasn't just fast, it was accurate.
Madara was invincible. Unlike Kaguya's time, before ninjutsu he had an array of abilities along with the chakra reserves to mitigate the dam. to a point of negligence. This ability has been shown by naruto but also has been shown to be limited to none vital areas, while Madara's is limitless and has no restrictions on his vital spots. Which means he didn't have weaknesses minus the fact he was concocting his own demise by meeting the requirements to resurrect Kaguya. Kaguya had to rely on Zetsu for fight tactics, her battle rating was low, she simply was a God that never met another God. If Kaguya had Madara's training, there'd be no Naruto (Show) or it be called Kaguya. No teleport, Chakra shield, or healing ability below Madara's is surviving. TSB are a mixture of all chakra natures and they broke to 6 and 7 gates.
Basically, 8 gates breaks Naruto and Sasuke down before they can understand what just happened.
I'm a die hard Naruto fan, but I'm not a liar. What Guy did was unreal.
Btw, Kaguya is invincible too. (When you have to sealed, you're invincible.)