Imu beating Luffy is nice. I definitely think he should kill someone though.
The juxtaposition of a flashback where the Wg kills every single person on GV(not actually, a few did escape, but you get my idea) to no one dying on Elbaf is just a bit much. I think Gaban, Loki and Brook would be the best options, but obviously Oda is probably not going to do that