I'm going to venture forth what will likely be an unpopular opinion but...while concussions definitely kept Hishon from ever even getting a legit shot at the NHL, I don't believe he would have been good enough for the pros anyway. Even at the time that was believed to be an off-the-board pick, and Pracey's track record certainly doesn't lend much confidence to any supposition that he would've ended up being a good NHL player.
So, while I too automatically think of Hishon's story as it applies to this, I think comparing the two guys too closely is a mistake.