What if Imu ends up taking over Blackbeard's body?
There is no way Blackbeard is strong enough to face Imu head-on but it would be a wild twist if his endless greed ends up walking him straight into a massive trap..
Imu definitely knows Teach is the biological son of Rocks D. Xebec. Carrying that hated "D" initial means Imu will want to eliminate him immediately, which will probably lead to a brutal fight where Teach gets completely outclassed by Imu's insane power. But Imu also knows how corrupt Teach is and how badly he wants to rule the world. What if Imu freezes the fight and offers him something he can't resist, like a seat on the empty throne..? Teach is so arrogant and blinded by ambition that he’d take the deal on the spot, thinking he somehow won.
But that power will come with a price., letting Imu completely corrupt his weird multi-fruit body and take control from the inside. It would combine the two biggest villains into one final boss for Luffy and it makes perfect sense out of what Whitebeard said at Marineford; that Teach isn't the guy Roger was waiting for. Instead of becoming the pirate king, his greed just causes him to get played by a much bigger fish and completely lose his identity. Who knows what Oda will do but it feels like a wild way for things to collide.