1. Either he one shotted it, or Broly is the single fastest character to ever appear in DBZ. Take your pic. Broly did it over an incredibly short amount of time. So he is either many times FTL or a near galaxy buster. Choose one.
2. Only he has destroyed more than a planet. And Broly did so while not even near the planet. Easily. And in the first movie he destroyed those alien's home "PLANET", not moon.
3. Because SSJ2 might not have been invented at the time is my guess but I am not sure. And this is all pure speculating you are doing.
Good freaking God is Dark Jaxx a freaking moron. Where do you get these things from? A 5 year old kid? Broly never used one move to destroy a galaxy. If he could do that he would of killed all of the Z warriors who were on earth at the time. Broly went to planet to planet and destroyed it thay way. Either way Mystic Gohan, Vegito and any version of Buu are more powerful than Broly, Trunks or Goku.