True but the way youre spinning it is pushing it imo. I think he just thought Xebec would do his job so he dipped.
This flashback Oda made it clear Imu only does stuff if he think it will effect him .
People hype rock to hell saying that in went into Imu room and Imu could not do him anything .
15 years later Imu roll up on rocks take the strongest attack in the series and then neg him .
Making kill his famliy and begging people to kill him .
Roger simple not someone that Imu care about now , it did take him 15 years to decide fuck up rocks.