100% this. I've been watching since the late 60s and seen all those superstars parade in front of me. Lafleur was the most exciting, Robinson the most dominant, but nobody was as intense as Roy. He started out as a skinny kid whose life seemed to depend on stopping the puck, then evolved into this simmering explosion of anger at anything that dared enter his crease. Totally focused on winning, with reflexes to back up that massive ego.
Not surprisingly, he left the team the way he played for them -- in a big intense explosion. And also not surprisingly, immediately won a Cup for the Avs.
If the category is "Player Who Made the Biggest Impact", I'd say Koivu. A warrior, a class act, a great leader, a loyal Hab, plus the personal courage of battling cancer and establishing a foundation for it.
That moment of him stepping onto the ice for the first time, shaved head, human fragility and athletic strength all wrapped into one, is a snapshot for the ages.