Everything in this thread is highly subjective.
Yes, Musty chose CHL and regrets it, specifically because he's stuck there. With a transfer agreement, he wouldn't have had to make a decision 2 years ago that locks him in. He could have had a good D+1 in Sudbury and then moved onto an NCAA program since Sudbury couldn't/didn't trade him.
Dickinson is crushing it at London in his D+1. A NCAA program may not match the volume of competition, but best-on-best in NCAA is very arguably as good or better as CHL and the schedule might actually be better for his development. I think the best outcome for him is AHL next year, but if that's not possible for him/others in the future, then it is very possible that some players might choose NCAA over spending D+2 even more dominantly in e.g. London.
The alumni list of the Knights is great, and all the past stats of how great the CHL is, but that doesn't mean it will always be the only and obviously best route for good to great prospects. Note that nothing in my post ever said "this is definitively going to become the #1 route for players." I was only making cases for where it might be the best route. Surely you can see that more options might be better for some. Or maybe I'm overestimating and you just think the CHL is best and will always be best for every prospect.