Okay guys, Hear this out

After this chapter, and After understanding a little bit more of Luffy's gear 5 Powers, i am sure that this was Joyboy that decided/had to clash with the World Government before the Void Century. Luffy is stabbed by Imu for avenging and Remembering what JOyboy tried to do to the World Government 800 years Ago.

Because, he Wanted to protect the childs of Elbaf, but tragically lost and the childs were killed. Because he tried to protect them, instead of letting them go and fight for their own lifes.

Eventually the Kids were from special bloodlines and familles also. This could be One of Elbaf's biggest secrets and the secrets of the Devil fruits creation too.

Two idéologies, One same goal from an opposite perspective. Joyboy was Imu's Nemesis and lost. He was also secretly aiming for eternal life, perpetual Youth and strength beyond limits.