Hidan tanks ShinsuSenju pounding, let alone Tsunade's punches, because no blunt attacks work against him as showcased by Kakuzu's Atsugai.
Kakuzu's atsugai is not the reason blunt attacks don't work, although that is a pretty solid example of him being unaffected by blunt attacks. Hidan breaking his bones and showing no hindrances in movement is the reason blunt attacks don't work.
Theoretically ShinsuSenju has the capbility to vaporize Hidan with nonstop beating. With enough force anything is possible. If Goku used blunt force on Hidan he would cease to exist.
Tsunade on the other hand is not dismembering Hidan, nor is she capable of an endless barrage of punches which Hashirama provides, what Tsunade is gonna do is break his bones, which again does absolutely nothing to him as per manga canon.
Only thing that can stop Hidan is dismembering him, which she isn't capable of without somehow binding him. He's too agile to allow that.
Easy outcome.
-Her offense cannot stop him.
-Both are immune to internal damage
Only difference here is Hidan can survive a headshot, and Hidan needs only 1 drop of blood, while God knows what she has to go through to threaten him.
Yeah but brain cells are still cells that can be regenerated and its not conscious, once regen is activated they'll be healed lol and the problem is here (specifically) is that no OBJECT is actually going to remain present in the brain, so once the cells are restored it functions fine.
Doubt it, everything starts at the brain, whether its conscious or not. Cellular regeneration cannot occur without the brain.
This is a longshot from being true.