I suggest you read World War: Hulk... He's often referred to as Worldbreaker... Yes, he's destroyed planets...
He still can't fly. Also, I gotta say, Instant Transmission gives DBZ the edge if Goku goes for 1-2 at a time & drops em off in the middle of space or some other planet to isolate or just kill them off.
Remember what we did to Japan with just a couple of atom bombs? Say goodbye Azeroth. Let's not even begin talking biological warfare, something else that would entirely wipe out Azeroth within weeks.
He still can't fly. Also, I gotta say, Instant Transmission gives DBZ the edge if Goku goes for 1-2 at a time & drops em off in the middle of space or some other planet to isolate or just kill them off.