Questions & Mysteries Will Imu take the W or L on Elbaf?

[D. Plant]

Imu is the one who ruled this world for 800 years. He is the Main Evil in this story, whatever you would say. Teach can be the final villain, but he will never would be able to surpass Imu in evil.

The story hasn't been implied to be that simple. Like Robin said the history will repeat it self if people don't learn from it. Ever since the reveal of the first and second world from the harley text, her words make a lot of sense. First and second world have the bad ending, so the solution is the break the cycle. The ultimate evil will fall, but there will always be another evil waiting to takeover. If people want to believe defeating current King of the World is the better end of the story, then go ahead and believe it.