I think there's an inherent danger with marking Beniers down as a yearly Selke contender. It reminds me a lot of the discussion that penciled Sanderson in as one of the best shutdown defensemen in the NHL. The defensive part of the game is a lot harder to pencil someone in as NHL elite when they are still a draft-eligible prospect. It's much easier for the offensive side of the game. The defensive side of the game puts a much bigger emphasis on intangibles, hockey sense, intricacies of the game that are much harder to measure.
This isn't to suggest Beniers can't be a yearly Selke contender. He might, but even the guys who are now yearly Selke contenders weren't good enough to be penciled in for that when they were draft eligible. Otherwise, you aren't drafting Bergeron or ROR in the second round. When you draft Beniers in the spot you do, you have to prepare for the possibility he's merely above-average defensively. Can he justify his draft slot if he never becomes better than above-average defensively?