Dragon didn't have a single combat related feat or portrayal in the series. So far, he was hiding on an island fighting fodder wars in countries, was driven out of his base by BB and send his executives into a suicide mission while sippin some tea.
His entire hype rests on the fact that he is the dad of the MC, son of Garp and most likely has the highest bounty.
Don't get me wrong, i wank Dragon myself and think that he is a Top 3 fighter, but he sure as hell wasn't portrayed like a beast in the past 900 chapters