Occam's Razor.
Which is more likely - that Hutton and McCann were sub-par AHL players in April (worse than their peers who joined the AHL late in the season) but somehow had a miraculous summer where they turned into NHL players, or that they were (like all those other high draft picks) good enough to help in Utica but a coach decided to stick with 'his guys' at the expense of development?
The notion that every other 2014 #1 pick was good enough to help their team significantly late in the AHL season except for McCann is laughable. Especially when McCann was better than most of them next time a puck was dropped.
"at the expense of development"
This is where I find the problem with your argument. It is easily possible that Hutton and McCann could have helped the Comets. I also joined in advocating a look at McCann. The posters claiming the win the cup with them is BS. No one can know what the results would have been. Its sheer guessing.
My question is how did not playing cost anything in the development of either one of these guys? If they were so adversely effected how did they magically make the Canucks roster 3-4 months later especially since, as some have just posted, the summer had no effect on their game between then and preseason camp? It may be argued they were ready, which I have already agreed to, but their development was obviously not harmed in the least. If a player has it, leaving his last amateur season and then entering his first pro season, the talent will be present. Whether or not he gets a few pro games or not will not change that fact. Their were Jr's whose parent club didn't get into the playoffs or exited in the first 3 of the opening best of five. Were they doomed going into the season any more than Hutton or McCann?
I believe it was Jake who said they all learned some of the big the differences in the pro game and amateurs. He said the pros paid much greater attention to off ice workouts, paid more attention to nutrition and rest. There is added pressure of so many games so close together and having to be ready every shift in a game, and coping with the speed and strength of the players was an eye opener. There was more but that's the best I can thumbnail from memory. Their experience here was valuable in spite of how it turned out for two of them. Jake played 10 playoff games and didn't exactly set the world on fire with one assist and he also made the Canucks so what was the difference in their "development"?