It’s almost guaranteed to be the 2nd option imo Imu won’t fall here but I think Oda will flip the script by having 2 main antagonists instead of one
BB who wishes to become the King of the World and Imu who wishes to maintain the world that he’s created
Vs Luffy who wants to liberate everyone
It’ll be a 1v1v1 imo (including whatever alliances they may have forged)