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Fukasaku outright states Sage Mode to provide a passive durability boost.
I wasn't talk about healing power. I'm talking about flat out durability. 50% KN4 was immune to Orochimaru's Kusanagi blade. This is the Juubi we are talking about - there will be a massive durability boost.
Real life people don't have the durability or resilience of a standard ninja. The attacks are more dramatic, as are the ninja taking in the damage.
Part I Naruto's half-assed Rasengan blew up Kabuto's innards to the point healing was not an option. Any internal damage done by Odama Rasengan can be assumed to be tiers above that.
Let's ignore the one that vaporized thousands of sharks and instead use one of its low end feats.
Let's ignore that it was performed underwater, had to travel through a condensed water shark, and was performed without intention to kill. Let's ignore the one that destroyed Madara's V3 Susano'o.
In your mind, perhaps. Not in this manga, though.
In this manga, Tsunade was stomped by a far weaker version of Madara despite being backed by a plethora of team mates. In this manga, Tsunade is a forgotten side character that is unlikely to be ever mentioned again on a serious note. She had her moment to shine against Edo Madara, and she got stomped along with the other Kage.
Meanwhile, a tired Gai blows up the same Edo Madara's Susano'o despite him being in a sorry state, and is now pinballing the strongest character in this manga's history. Tsunade being stronger than Gai, whether in feats or manga portrayal, is nothing more than deluded fanfiction. Gai has proven himself to be far more capable than her via feats, and his relevance in the current war puts hers to shame.