We all know that Kaido owes Big Mom for something major, a lifelong debt.
I have read various theories according to which Big Mom made Kaido immortal or Big Mom gave him children (Katakuri, Oven and Daifuku) or the lifetime debt is related to the Numbers.
But after reading some theories according to which Kaido’s son is actually dead and therefore Kaido drinks to forget, I came up with something new.
What if Kaido’s son was about to die but before he died Big Mom took his soul and made a Homie out of him? In a sense Kaido’s debt would literally be a lifelong debt.
*Theory by Juanray123