Um, I'd say. Blackbeard kills all 4 yonkou, and has like a bounty thats around 5 billion or something, along with killing Kuma and Moria (I think Moria will continue to be Shichibukai after he is beaten). After that, he goes to Raftel, and finds Luffy about to open the final chest, but his whole crew is off living their dream, except Zoro who they left on the 24th island to fight Mihawk. Blackbeard sucks Luffy in and basically stabs him with his fist, going right through his stomach. They fight, after Luffy does some technique that shoots them both like 4000 feet into the air. A dramatic fight in the air, and finally Luffy does his ultimate technique and shoots Blackbeard into the see, instantly drowning him. Note: Luffy's crew will meet up with the rest of the BB crew. But not all. Brook vs. Laffitte. Ussop vs. Van Auger Franky vs. Jesus Burgess and Chopper vs. Doc Q. Finally Luffy falls to the ground and has a 10 page flashback of the whole series of One Piece, and dies happy, since the treasure was the ability to die happy, even if you have like 5 internal organs gone after fighting BB.