Find me a player that had their development ruined because they spent their D+2 year in the CHL instead of the NHL.
Do it.
I dare you.
KM - if you weren't aware - you're asking for the impossible, and you do it multiple times in this thread.
There is no way to definitely know who busted because they were rushed, or who could have contributed earlier because they marinated in a development league longer they needed to. Or in another case - who busted because they were rushed but they would have busted regardless because their skillset didn't translate to the NHL, no matter how much time they spent in junior or the AHL.
IMO - it depends a ton on the player. Some guys have the mental toughness and competitiveness to make the jump early - and most don't. I trust LR & the FO, who actually get to look the kid in they eye and have a conversation with him, to make the right call in that regard. It's not like LR is going to sacrifice KK's confidence this year to try and eke out 2 more wins to keep his job. LR know what his job is, and his chance of being successful long term is greatly helped if KK reaches his full potential.