Also wondering if a player like Graf (or De Jong) benefits from playing in a weaker league like the ECAC? And how do scouts adopt their evaluation to compensate?
They certainly do - until they don't.
It's really important to understand the league you're scouting before you just dive in. When I get any sort of special assignment outside of my normal territory, I take the time to watch several games beforehand...what's the pace? How are the games played? What kind of tactics are employed, generally? How is it officiated? What's the quality of competition? How many lines does each team have, legitimately? etc. etc.
Then you push that down into the player eval...you have to be really careful about what you're looking at. But you have to be even more careful about the scalability...how does the game translate to a more legitimate level of play? Are there are enough parts that make it palatable with the right development?
Graf has some skill. Not very dynamic, not much deception to his game. How adaptable is he? Looks fairly limited from that perspective in my passing views...pro? Sure. NHLer? Not sure I see that.