Like I mentioned, their data set was cherry picked from what was expected and has since proven to be the weakest draft in the past decade. The premise that "we know that if ten of these kids turn out to be 'special', it will be an incredible draft year" is wrong and not represented in the majority of drafts. I can illustrate further if you don't like the 2015 draft.
2014 you could name Christian Petracca, Angus Brayshaw, Jordan DeGoey, Darcy Moore, Jake Lever, Isaac Heeney, Jack Steele, Touk Miller, Caleb Daniel, Ed Langdon, Harris Andrews and Bailey Dale as genuine special players with others who could be added to this list depending on how much you'd like to argue.
2013: Josh Kelly, Jack Billings, Marcus Bontempelli, Christian Salem, Pat Cripps, Matt Crouch, Zac Merrett, Rory Lobb, Toby Nankervis, Alex Pearce, Tom Barrass, Aliir Aliir, Ben Brown, Orazio Fantasia, James Sicily, Matt Taberner, Jeremy McGovern, Rory Laird and Dane Rampe.
2012: Lachie Whitfield, Jake Stringer, Jack Macrae, Ollie Wines, Nick Vlaustin, Joe Daniher, Brody Grundy, Jack Viney, Tim Membrey, Lachie Hunter and Jack Martin/Jesse Hogan who were pre-draft selections due to concessions.
2011: Stephen Coniglio, Chad Wingard, Nick Haynes, Toby Greene, Sam Docherty, Taylor Adams, Brandon Ellis, Tom Mitchell, Seb Ross, Elliot Yeo, Brad Hill, Lachie Neale, Jarrod Witts and Jaeger O'Meara/Brad Crouch who were pre-draft concessions.
2017 for the record is a bit more subjective given the draft group is still very young and early into their careers but the players I'd say are 'special' or on the cusp are Cam Raynor, Andrew Brayshaw, Luke Davies-Uniake, Adam Cerra, Jaiden Stephenson, Hunter Clark, Aaron Naughton, Darcy Fogarty, Zac Bailey, Ed Richards, Jack Higgins, Oscar Allen, Tim Kelly, Noah Balta, Liam Ryan, Sam Taylor, Charlie Spargo, Bailey Fritsch and James Worpel,
Their statement that "but in terms of breakout stars, many of the grandiose predictions of the draft 'experts' tend to fall flat" is just wrong if you look at anything further than the weakest draft cohort for a long while. Even then, they're still a relatively young cohort so there's time for others to push into the 'special' bracket.