Well it more applies to college players, you can't hurt a players development by having him play a season more of college hockey (Faber) but you can certainly hurt a players development by pulling him a year early (Turcotte).
Despite being a huge fan of NCAA hockey, I prefer the Kings to take CHL players over NCAA players because it takes the destructive "Put them in Ontario and let them work with Muzz" strategy off the table for teenage prospects. If Greentree were doing this at Michigan or BC, it's very likely the Kings sign him with the intention of putting him on the Reign at 19. Byfield, Turcotte, Kaliyev, Bjornfot and Kupari all went down this path, and the results have been terrible, but that doesn't matter, they are right and everyone else is wrong.
The NHL should be a meritocracy, If Greentree is good enough to make the Kings out of camp next season, he should make the team, whether he is 19 or not. But the reality of the situation is (unless there is a management change) the Kings are going to send this guy back to junior for his age 19 season, and even if he has a historically good season, he is going to play a good chunk of his age 20 season in Ontario while "working with Muzz" and paying his dues. He's probably not as good as Clarke, and even Clarke got that treatment from the clowns running the Kings.
The Spits play in Soo a week from Sunday, hate that it's an NFL Sunday, but may make the 90 minute drive up there and see this guy, he looks like he's having a fantastic season as a D+1 in the OHL.
BTW, shout out to Liam's mom for holding tough, he was born on January 1st, meaning that he is only eligible for the OHL next season and not the AHL. Had he been born a day earlier he would be another teenager playing for the Reign next season.