I'm 50/50 on Imu and BB being final villains. On the other hand, Oda portrayed Imu as the ultimate villain who wants to destroy the whole world, is the king of the world and leads the strongest organisation in the world.
On the other hand, we have Davy Jones' descendant who keeps growing in power and he's ambitious as hell. He definitely wants to aim at Imu's position and he isn't interested for a title like "Pirate King". Just like being a Shichibukai, this was just Blackbeard's means to reach at something higher.
The chance is also high that a severely weakened Imu gets teleported back to Marijoa and Blackbeard ambushes him and takes his DF power.
You can talk like a normal human being once in a while
Yeah I agree on last paragraph tho
We have been talking about effect of Imu's time limit. If Imu was teleported back instead of going home on his own will, it should have consequence
And the consequence I think, he will be powerless. Like how Luffy became small kid/grandpa after Gear 3/4/5. Or when the firebenders in Avatar lost their power during Eclipse day.
And then Blackbeard Pirates are waiting at his home when Imu is completely powerless
Not sure Blackbeard can kill Imu for real during that powerless stage tho, maybe he will leave some big damage but that's it, not actually finishing Imu for real. For change, he will kill one of the Gorosei who is protecting Imu, which is probably Garling.