A broken will is worse than a death in OP.
Kaido and BM will come back to witness their own shortcomings.
Kaido will see what the real Joyboy is expected to do in the world, instead of manufacturing an army of clowns.
And BM will see that army of giants she so longed for be used by a rookie human to turn the entire world into a utopia devoid of soul taxes and brainless rampages.
By EOS, Kaido will drink to form new bonds (sake brotherhoods) and BM will learn to share her food (even with giants, thus finally getting more of that semla she wanted in her flashback).