Whose Blackbeard connected to though? A character we know nothing about ? Or is this gonna an example of inherited will where Kaido thought he was Rocks successor but it was actually Blackbeard sought of like how the world thought Ace would be the dawn of the new age but it was Luffy
Well the thing is, the Rocks plot is 100% contuing past Kaido/BM. We know this now at this point and it seems very likely that Shanks and BB are very much tied to it.
Blackbeard's ship is called the Saber of Xebec, I doubt that is coincidence. Shanks is 1 year older than God Valley, and Roger has implied he's had him/Buggy since they were babies.
I'm not 100% sure if Kaido thinks he's the successor of Rocks or not yet.