The Cats held McDavid to 0 points in Games 1, 6 and 7. He had 1 point in Game 2 and multiple points in Game 3, 4 and 5, so I'd argue that if you want to stop the Oilers, neutralize McDavid. The Cats blueline did just that, so they're better than McDavid.
That's why I consider Crosby better than McDavid. At the end of the day, you have to find a way and elevate your game, not in those others games where you put up dozens of points, but in the games that matter the most. That to me defines greatness. You can win every trophy but if you can't win the trophy your team is going after, what does that say about you, especially after your team put the foot to the floor, evened the series, broke the Cats resolve and moved in for the kill after winning Game 6 without any help from McDavid. That moment, Game 7, is when it matters for you to be the greatest player playing in the NHL today, when you should put the team on your breaking back and stumble out to end it and fufill your destiny.
The numbers don't define greatness, the moments do.
Pat Maroon scoring a garbage goal againt Bishop and pushing the Blues forward in 2019 doesn't seem like much at all, but that moment made him legendary because of what it all eventually led to and meant. He'll always be the hometown hero and his name is proudly etched on the Cup.
McDavid had that moment and didn't fufill it. The thing is, he's so talented that he'll get another shot, when that moment comes, hopefully he takes it.