DB doesn't? My original question was why is he less credible than them? This whole thing is just a big my dad can beat up your dad argument, so I expect a lot of bias on both sides.
But now that I think about it, I think I'm just tired of this discussion popping up multiple times a day. There is no definitive winner. Both of these characters lose fights all the time, so no matter how you look at it it's still just glorified fanfiction.