Lord Humongous was never "supposed to be" Jim Goose. That was a very early fan theory birthed because mild burn wounds seem to be evident upon the back of Humongous' head. Too mild to have ever been Jim Goose.

ENOUGH with the Furiosa timeline. The beauty of the original trilogy was that it was always different eras in Max's life, and different areas of the Wasteland. New characters and new conflicts. Fury Road and Furiosa were great. But good Lord, George, ENOUGH. I don't need to see or hear anymore about the Citadel or these people. Let's move on and explore something different.