Had he died in the previous episode, it would be a more honorable death like short of a Samurai battle of skill, with the realization that the new generation can be stronger... But his anger got the better of him and he turned into a hideous being, no wonder his katana was horrible, his face too... All to prove that is just not worth it. But yeah I also wanted to see him regenerating his head because as #1 it would be weird if he didn't xD
Please guy, press F for Ufotable... They have to animate all this fights in succession with super quality and no comedy in between
By Muzan logic, then the strongest demon was actually #2 all along, why? because he was the only one who didn't feel a bit of remorse from his past life, he had no one to grieve or love and he enjoyed being a demon the most, but he had too many enemies and that was his demise, they were prepared to fight him specifically.