Personally, I don't think Momonosuke and co were the ones who faked their own deaths. My idea is that Kaido, after they escaped from him, claimed to Wano he had killed their entire ruling family to crush their hopes, including digging empty graves to aid the lie.
Of course, the problem is letting the people of Wano know they're still alive without actually winding up in those graves.
Please stop being idiots people and theorising they are dead and that oden is alive or momonosasuke is oden or even oden had the time time fruit and sent all his retainers to the future. These are all bizarre claims.
This reveal was just a way of Oda trying to confuse you , relax lol
