I can barely comprehend how the top ranked player for the draft comes from a place like Arizona, where hockey isn't as popular, he is facing lesser competition growing up etc. It's not like he was the son of a former NHL player or former hockey player either which is usually the case for players who end up developing well in non traditional markets ( Nylander, Levin ). Certainly a Seth Jones type situation.
If you think that facing better competition makes one better, and popularity of the game motivates kids, than you can understand why Toronto, Minnesota, Alberta, Michigan etc tend to produce the elite talents. At age 8-12 its pretty much evident who will become a good player, 12-15 theres another development curve where you can pick out the elite talent pretty accurately. Of course theres the few late bloomers too, for Matthews to have developed such high level skills as a product of Arizona is pretty unique itself.