That is rather unfair to Stukel, who missed his entire 16-year-old season with a torn ACL. As far as I can tell, Emerson Etem never stopped playing hockey for any extended period of time as a teenager. From the age of 15, which is as far back as EliteProspects goes, Etem played most of his games and developed at a normal rate.
Stukel lost an entire year. Prior to that, he had a very promising youth hockey résumé.
http://vancouvergiants.com/giant-futures-jakob-stukel
He ended up with 30 goals for the Valley West Hawks, which is more than either Kane or Gallagher scored at the same level.
He also had a fairly strong initial stint with the Giants in 2012-13, scoring 2 goals, 4 points in 6 games as a 15-year-old.
This past season is what his 17-year-old season should have been. Instead, he was a year behind because when he finally got back on to the ice for the Giants after his injury, he was a 17-year-old playing with the fundamentals of someone who had just graduated from the Major Midget level, had only played six games in the WHL, and who had not played hockey in over a full calendar year. This is a fairly severe handicap for an aspiring hockey player at that age.
The Giants also cycled through three coaches that season, which logically would have made it more difficult for him to learn. His rookie season, as a result, was underwhelming.
In his sophomore season -- this season -- he really started to put things together again.
If not for that torn ACL, I think Jakob Stukel would have received much higher regard as a prospect. With the Calgary Hitmen this season, Jakob scored 34 goals, 56 points in 57 games. At the same stage in his development, Emerson Etem scored 37 goals, 65 points in 72 games.