Problem with this is that Imu is responsible for every atrocity known to mankind in the last 800 years. You can’t even sympthasize with him nor his minions who are personificantions of pure evil. Defeating Imu resolves every problem, everybody has a personal score to settle with Imu, even Blackbeard. Blackbeard can be a surprise final “antagonist“ or the last fight, but atp, Imu is the true villain of the overall narrative.