1) Kaido isn't dead: I feel this one is possible, bc kaido has tried to kill himself many times and failed in doing so, I mean the lava would damage him srsly, but it might not kill him. In fact, I think he can't die, bc all the hype they gave kaido pre Wano arc would all just be overestimating kaido, and I'm sure they didn't overestimate him, so he might not be dead, and he is somewhere waiting for when to appear
2) The four God fruits: They say that Oda hinted at them in skypiea when they were worshipping these four gods: Sun, Rain, Plant, Earth. After awakening, it's clear that the other 3 should be out there. Now ppl they think is a god fruit user:
I) Dragon: They say he's always seen in the rain or storm.
II) Imu: Considering that he is associated with plants and animals, maybe he's the plant god user.
III) Gorosei: They think one of them is the earth god user, for keeping control of the earth.
Side theory: I saw another one talking about dragon having a ryuu ryuu no mi, so I'm not sure which one makes more sense. But ppl do believe dragon has a df.
3. Bro, any df Sanji has will be used in a new way by Sanji: In the anime, they said sanji wanted the invisible fruit for his own desires, in a Yt short, they were saying it's good Sanji didn't it the doa doa no mi, or else all women would live in fear when they take a shower, and in another one, Oda said if Sanji had a df, it would be the df that let's him swim on the ground and other surfaces, which again, he would use for his own desires. Basically nami should be stopping any df that sanji wants.
What do y'all think? @L725 @Atlas D. Aeradon @Seekerbro