I think you can boil it down to not having a standout skill, set of tools, or overwhelmingly dynamic element to his game up to this point. His production doesn't typically come from flashy plays or a big shot. His defensive game isn't physical/smothering. While a very strong skater, he's not particularly big or strong. From what I saw last year, he's kind of a jack of all trades, high-IQ, strong positioning type that's been surrounded by flashier, bigger, older players. I think there's been a lot of question marks about whether or not he's "the guy" on his pairing/unit/team or just a strong facilitator. Top-20 pick, seems a pretty safe bet for NHL minutes.