Kokushibo's Final Stance

What if Muzan realized that one of his Upper Moon demons had the potential to be stronger than him? That he took it upon himself to give Upper Moon 1, Kokushibo, enough blood to make him strong enough so he can become the new demon king.

This was just a giant what-if that I was thinking of while reading the manga and seeing how the fight with Kokushibo was my favorite fight in the manga, what would happen if Kokishibo was much more powerful and fought all the hashira including his brother's descendant.....

I know for the upper moon fights and the fight with Muzan I sort of brushed over since that wasn't the main focus I was aiming for while writing this. There will be a giant multi-chaptered fight with Kokushibo at the very end once I'm finished writing this.