The thing with Gretzky is how far ahead of everyone else he finished.
There are a number of guys you might look at and say could've/should've/would've, but at the end of the day they weren't even close.
Additionally, there are a lot of guys whose skills you would look and think they should've revolutionized the game. They were bigger, or stronger, or faster than Gretzky. But they also didn't come close.
I mean the scoring difference between Gretzky and Jagr is a HOF career worth of points. That's insane.
Now, I never had the chance to see Bobby Orr play live in my lifetime, but he's another one who was so far ahead of the curve that it almost seems comical. Then you watch videos of him and it looks like he's toying with kids.
When I think of the the best of the best, there are three names that pop into my mind --- Gretzky, Orr and Lemieux. I had the opportunity to witness two of the three in my lifetime. I've not seen anyone else like them.