That video was painful to watch. Of all of those misses maybe 2 or 3 were tough grabs on alley-oops but that doesn't excuse the overall frequency in that he misses dunks.
Here's a link directly to the video, I do recommend reading the article that
@Praxis posted though. It talks about how he leads the leagues in missed dunks, compares that to other players in the league, and historically. It also gets Chriss' reaction to the video being made because apparently he's watched it. He tries explaining why he has so many but I don't think there is any excuse for that when you're 6'10 and have freakish athletic ability like he does. He's shooting 79% on dunks, which is apparently the worst of any pro since they've been tracking attempts like that going back to 2001.
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