Dude, your concept of Dragon Ball Z is non-canon I assure you. I'm a DBZ fan myself so I never once understood how you people can so easily over power scale the Z Warriors. In the official script Lord Bills was described to be powerful enough to destroy a solar system, not a galaxy as mistranslated in the American version, and stated after fighting Goku that he still possessed a little energy afterwards. This puts Bills on a solar system+ scale and Super Saiyan "god" Goku on a scale where his energy could be felt throughout a solar system. The Silver Surfer holds the feats of destroying a solar system, creating black holes which I assure would kill Vegeta and Goku, and being able to survive in space unlike Goku and Vegeta. Galactus is capable of devouring entire dimensions, and rearrange all forms of matter and energy to the point of manipulating reality; meaning Goku's ki could easily be plucked from his body and used as an insignificant snack to Galactus. Oh, let's not forget Galactus' third arm, the Ultimate Nullifier. Which is a weapon that was born along with Galactus that could destroy a universe and beyond.