If some folks had their way, Reinbacher would make his NHL debut at 24.
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Strawman.
You're on this crusade along with a certain Coach concerning development. Your thesis is that rushing a player to the NHL cannot cause any damage to a career, ever. It's a really specific and curious stance. Maybe I'm strawmaning your point myself, but it's been thousands of posts on this forum, dating back to last year, from countless posters, including yourself, and me on some occasions.
So now, the goalposts have moved to defining the term "slow-cooked" (I'm not saying you personally moved them, just that it's now the focus). I believe this is not a constructive debate, because the term is subjective, it doesnt have a clear-cut meaning. It's goddamned food analogy ffs lol.
I'm mostly concerned about the D+1 season of a player. Reinbacher is developing somewhere else in his D+1, and for me, even if it would be for just one year before asking him to join the club, it shows at least some sort of patience and caution from management.
On the other hand, you have #20. He was played right away and is struggling mightily. The dude is talented, but he's overthinking everything right now (probably because his confidence is shot).
There are obvious reasons why dressing a player at 18 years old in a crazy market like Montréal is not a good idea. The media, the pressure from the fans. Wouldn't you agree?
Now, what would be the downside of playing an 18 yo Euro 1st round pick in Laval at the start of his career, and reassessing every other week or month. Would it have been
damaging to act cautiously, considering the history with KK and Galchenyuk (one is fine, one is not, but both have left and are of zero use to the Canadiens, and both were rushed at 18).
Seriously, what would be the downside? He'd be too good and get bored? Then... you call him up. Doing this backwards, though, is way more delicate. You risk affecting his confidence even more by sending him down.
For me it's not about the risk of having them bust. I think that it's very difficult to isolate the definite factors behind a failed prospect. It's about what is the most rational decision on day one of their D+1 year.