i am more interested in knowing who Kaido did baam..
Could always be a homie. Perhaps that's the life debt he owes Big Mom: Kaido wished for a son, so he willingly offered up a portion of his lifespan to be extracted and used in the creation of a homie he'd raise as his own child.
Why not sire a son the old fashioned way? Maybe he truly is the last of his kind as per popular theory -- the last living dragon.
Saw an interesting theory posted by Flying Panda that posits the reason Vegapunk was breeding dragons on Punk Hazard was because he was doing so at the behest of Kaido; an attempt to create a suitable natural vessel for his son's spirit. Panda would also speculate that Kaido's son actually died previously, his body being used to create Momo's devil fruit.
Alternatively, natural born dragon Yamato's on the verge of death -->Big Mom transfers his entire lifespan to create a homie --> Kaido somehow meets Vegapunk and convinces him to clone an appropriate body for his homie son?
Who the fuck knows.
That said, given some versions of Japanese folk hero Kintaro the Golden Boy aka Sakata Kintoki aka Kaidomaru portray him as the son of a dragon and a mountain hag, I could see Oda adapting this version of the tale by depicting Yamato as a gold statue homie or something.
Granted, one could argue that Sentomaru of the Marines already has the Kintaro reference covered...but then, there's a few oddities I noticed as he's concerned; (a)his name includes references that more align with an association with the Momotaro legend; (b) his name could also be translated as "Lead Boy," which makes me wonder if Oda isn't playing some other kinda game here. One thought that came to mind is that "Lead Boy" Sentomaru's might go a figurative alchemic transformation into a true "golden boy" by inheriting Sengoku's Daibotsu devil fruit as point because PLOT REASONS, but I'm getting ahead of myself here.
Consider too that Tama's abilities fall more in line with the character of Momotaro that his One Piece stand-in Momonosuke, and you get the sense that something funny's going on. Given Oden's own Herculean allusions as embodied by the feats he pulled in his younger days, makes me wonder if Oda's playing mix and match with all these various figures and their identities.
Based on that, and Yamato's apparent disappearing act, I'mma take a shot in the dark and guess that Yamato's a fusion of both the legend of Kintaro/Kaidomaru and a demon with a very similar name -- Kidomaru, the son of famous oni Shutendoji; an oni child with a propensity of lying in ambush in to spring failed assaults on his father's slayer, legendary samurai Minamoto no Yorimitsu/Raiko, notably once doing so while hiding in a latrine and later while disguised within a cows' hide.
https://en.wikipedia.org/wiki/Kidōmaru
https://abbatefineart.com/product/sakata-kaidomaru-kintaro-and-the-carp-2/
If Kaido's suicidal tendencies are born in some part from self-loathing or legit desire to die, it'd be interesting to see a homie crafted from his soul embodying this aspect of his personality and hate his "father" in turn, repeatedly to stalk him and kill him in a manner echoing Ace and Whitebeard's relationship in the early days.
Anyways, just tossing some fun ideas around. Again, who knows; next thing we know, Oda will reveal Yamato's a regular dude with a human baby mama or whatever.
