Tawnos
A guy with a bass
The problem you'll always have with this argument is Gretzky's dominance was limited to offense. It's precisely why some would argue he's not the top hockey player of all time. If you're going to compare him to other athletes then you have to consider that some of the athletes considered the most offensively dominant in their sport were also considered amongst the best defensive players in their sport too. I'm sure someone will argue "best defense is a good offense" but that just doesn't cut it for me when players in other sports had BOTH abilities.
But is Gretzky's dominance limited to offense because he wasn't as good defensively or because he was never asked to play defensive hockey? His biggest skill was his ability to read the game. Turns out that this is also the most important asset to defensive players. Had that been applied to defensive hockey in balance with offensive hockey, Gretzky would've been considered a great defensive player.