To me I feel like that just strengthens my point because if you're good enough to play, you will as we've seen with the players I've mentioned. The better players usually get drafted higher and the lower picks take longer to develop.
Sure, but I think it ignores a lot of context surrounding Cossa. Not every draft crop is the same, so even just a blanket statement like top 15 picks need to play in the NHL within 4 seasons or they're being held back is tough to apply across drafts. Then when it comes to goalies, even first rounders take longer than skaters in the same pick range. Askarov was drafted the year before Cossa and he's only now this season getting "regular" NHL time as a backup with 8 games played so far (after starting the season in the AHL). He was a much more touted goalie than Cossa and drafted slightly higher (11th), and it still took an offseason trade for him to show up in the NHL for an extended period of time mid year.