This depends on how you define "duplicate". I said "copycat", meaning the plethora of follow-up stories that invariably appear when something big happens that don't include any new information, but either report on what has already been reported or are garden-variety commentary. Obviously, HN's front page doesn't have room for all of those. If you think that there aren't many of them, we must be working with different data.
It's true that during the initial period there were major revelations coming out every few days. But I was talking about later.