As usual, this kind of speculative thread has turned into the predictable "let's fantasize every possible way to demean Gretzky's achievements by giving all the benefits to everyone else".
Mario Lemieux erasing any of Gretzky's significant season/career records? I don't see it.
First of all, Mario enjoyed fine health and a team that actually told him "you don't have to play defense" (according to Mario himself) for his first 5.5 years in the League. How many of Gretzky's records fell, or were approached, during this time of Mario's full strength? One: most short-handed goals in a season. Full marks to Mario for that one, but it hardly made anyone forget Wayne. Here's how the two players compare after 6 seasons:
Mario: 1.96 PPG: 345G + 493A = 838PTS (+17)
Wayne: 2.37 PPG: 429G + 693A = 1122PTS (+374)
I mean, right off the first six years, Mario is already 84 goals and almost 300 points behind Gretz. That is a lot of ground to make up before he passes his prime, which likely occurs -- even if he's in perfect health -- about six or seven years later.
Second, the only season in which Mario seriously threatened any Gretzky season records (by pace) is 1992-93, the "easiest" season ever for top-line players to rack up points, during which Mario played on a better, more dominant team than he'd ever played for before or would play for again (meaning: this kind of scenario would not re-occur for him, regardless of his health). His per-game stats that (60-game) season are highly inflated by the ridiculous hot-streak he was on at the end of the Pens' season, when they went 18 games undefeated and he scored a bazillion goals. But in the playoffs, after scoring 4 points in game one, he then scored 14 in the next 10, to close out the season. He simply was not going to maintain that pace.
Lemieux after 1993 is tricky, because of lingering back-issues and, I think, some confidence issues after his cancer scare. It would have been nice to see him play every year and dominate with his amazing skill, but playing enough to break Gretzky's records...? I mean, this is the guy -- the 6'4'', 230 lb. guy, mind -- who quit pro-hockey because it was too hard, and preferred golfing to representing his country.
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I would have loved it if Orr could have stayed a Bruin until well into Ray Bourque's era, say until 1984 or something. But I have this feeling that if he'd been in Chicago, still in health, from 1976 to 1984 or something, he'd have been a 85 point, +20 kind of defenseman who'd have made the All Star team regularly, but not the 1st position, and would have been on some bad losing teams. (We may have had to suffer the indignity of Randy Carlyle winning a Norris over Orr...)