Well, if you're going to be that nitpicking about dev diaries take a look at the Burglar one. Unlike Captains, it specifies "massive burst damage" rather than "heavy burst damage" and to my knowledge massive is of higher order than heavy (
http://www.oxforddictionaries.com/de...sive?q=massive ), so with that logic Burglars should do more burst damage than us.
The dev diary also does not specify heavy burst dps, it specifies heavy burst damage so you probably did misread it. Having high burst damage is not equal to having high DPS so your "Bring out some screenshots of parses where captains rock sustained (2 minutes+) 4-5k DPS" doesn't really have anything to do with the description in Dev Diary.