Fujishiro, it makes zero sense. Rocks the retard told Imcel at the start of the flashback he was a "davy jonesian" pirate, and Imcel didn't even care. Like, he just let him go and let him be unbothered for 20 years after that. And then he decides to let 2 D's attack him, and he just leaves afterwards......................................................................................................only to return to destroy god valley, I guess.........................?
I genuinely don't even know how Imu would even fight Luffy at this point. He would just not care because he's only a monkey, not a davy or whatever the fuck