He was without a doubt one of the best passers, if not the best to ever play the game. But what is the key to that ability? Is it more of a physical gift or more a matter of uncanny vision? I tend to lean towards the vision must be there before the physical ability to be a great passer. Although that isn't to say there isn't a definite physical part involved.
It really was a combination of mental and physical. Gretzky almost certainly had the best "vision" of any player, ever, in that he could see that if he got the puck from Point A, his stick, to Point E, then a teammate would be able to score.
But that wouldn't have made the slightest bit of difference if he didn't have the physical skill to thread a pass through points B, C, and D, which tended to be opposing defensemen, skates, sticks, body parts, etc. Gretzky didn't just see where the puck should go, he put it there.
Which holds true for his goal scoring. Other players had bigger shots, or shiftier puck handling. But they didn't score as much. Because just like with his passing, Gretzky was the best at seeing exactly where a shot should go, and shooting it there. Sure, stand up goalies wearing smaller pads left more openings than today's goalies. But Gretzky scored on those guys more than players with "better" shots. I see no reason at all why he wouldn't be able to outperform today's "better" shooters the same way now as he did then.
The game may be faster today, but it's not magnitudes faster. Gretzky *was* magnitudes faster at playing the game back in the 80's. I've said this several times before. When Mario Lemieux had the puck, it was like time stood still, everyone in the rink knew what he was going to do, but he was so supremely gifted no one could stop it. Gretzky was the opposite. He'd have the puck, and you'd have no idea how a goal was suddenly scored until you watched the replay, and even then it was difficult to figure out why Gretzky had just made a play that would not have been turned into a goal if any of the player in the league had been in the exact same spot. Lemieux slowed the game down, Gretzky sped it up.