#6 overall draft picks since 2000: Scott Hartnell, Scott Upshall, Mikko Koivu, Milan Michalek, Al Montoya, Gilbert Brule, Derek Brassard, Sam Gagner, Nikita Filatov, Oliver Ekman-Larson, Brett Connolly, Mika Zibanejad, Hampus Lindholm, Sean Monahan, Jake Virtanen, Pavel Zacha, Matthew Tkachuk, Cody Glass, Filip Zadina, Moritz Seider.
There's only one, maybe 2 guys on that list that list who would ever be considered "elite". Several of them had long, unspectacular NHL careers. Some never panned out at all. A couple are too young to yet evaluate. But, even if Zadina turns into the player even you have admitted he will be, he wouldn't even be close to a bust considering the company he has at that draft spot.