wouldn't say "so much" hype, he's just one of the top 3 players and tsn's sportsnet will try to find players to talk about and it's those 3 guys.
In terms of Ehlers, Ehlers had Drouin as a teammate, certainly helped his numbers. The Following year he had Mier to play with. Zadina has really nobody to run up his stats with. Give him a Drouin and Zadina would have ripped the QMJHL apart. Zadina also has the highest (shot contribution to his team) among CHL draft eligibles fowards, higher then Svech. in other words his team is getting more shots on goal when he's out on the ice then when Svechnikov is for his linemates. Truly a Grade A offensive generating machine.