Why did Rocks know that Imu exists?
Why did he invade Mary Geoise to just threaten them?
Why was he strong enough to do that, while being a complete nobody?

What gets me is Imu is actually talking to rocks. Not ignoring him nor trying to kill him. Rocks has to be a direct descendant of JB or part of the major D blood line. Hell he might be part of Imu's clan.