Luffy won't defeat Imu.
They are fighting him in a gauntlet and they will all be defeated, Imu will be forced to return to Mary Geoise because of the time spent in the lower world.
They are fighting him in a gauntlet and they will all be defeated, Imu will be forced to return to Mary Geoise because of the time spent in the lower world.
He already missed out on a definitive 1v1 victory in Egghead; Oda isn't going to pull that twice in a row.
And honestly, just surviving and holding off Imu easily warrants way more than a 4B bounty, since Imu already no diffed a far stronger version of the Luffy who had defeated Kaido.
Luffy will get 1B increase for causing the Egghead siege (contributing in Vegapunk speech) and for causing trouble to the World Govt. in Elbaf.
The next, and final, increase will probably make him reach 5,656,290,000 (go-mu go-mu ni-ka).