Board Thread:Theories and Speculation/@comment-45273751-20200322060033/@comment-4961229-20200406183803

This is entirely too broken. Wind Release is just an added bonus, but all of the other three have made some of the strongest opponents in the series all by their lonesome. Put them all together and you've got a powerhouse. Sage mode and Shikotsumyaku both increase the durability massively. Someone with a combination has unbreakable bones, super strength, and frog katas. They can combine frog katas with the six dances or whatever and be truly deadly. Now you add in 8-gates?!? Holy, $#!%! 8-gates alone was a threat to Juubi Jinchuuriki Madara, let alone with Sage Mode and Shikotsumyaku.

Since sage mode is a multiplier of strength and power, it's bound to increase both speed and strength of anyone using the 8-gates. Also, it solves the problem of tunnel vision stated by Rock Lee about super fast movement. Sage mode turns you into a sensor nin and adds threat perception. This totally removes this concern about tunnel vision. You can perceive a counter and alter your attack, as Naruto demonstrated against the 3rd Raikage.

Rock Lee would've obliterated Gaara if he were a Sage with Shikotsumyaku. Not only could he have totally avoided Gaara's attacks without opening so many gates, just by using threat perception. He could've stabbed right through Gaara's defenses with razor sharp bones and around Gaara's defenses wtih natural energy attacks.

I don't think it would help all that much with the strain however. This is because, while it gives you more durability, the chakra itself is far more powerful so you'll be under more stress than if you're not in sage mode. So unless the durability out scales the added stress, I don't see that happening. Something like Tsunade's Strength of a Hundred would be more suitable for that.

Sage Mode could indeed be what Shikotsumyaku users need to perform All-Killing Ash Bones. It's certainly a good guess and I'd put my money on it. However, without more information from the manga, who can really say for sure?