Not sure what you mean, Fox was drafted in 2016 by the Flames, had his rights traded to the Hurricanes (after the Flames were told by Fox he wouldn't sign), and told the Canes he wouldn't sign and so they traded him to his preferred destination, the Rangers, because he would have gone back for a 4th year at Harvard and signed with them anyways otherwise.
Regardless of whether the others became stars or not, it doesn't change that they were in demand prospects at the time. Obviously, statistically, most prospects turn into "bit part players" regardless.