Sundin is very high, but I think he may deserve it. I think he's actually been underrated at times, although he played in Toronto. He's never really had the big season where he was top-5 in scoring, but he's very consistently played with very ordinary wingers against the opponents best lines and come out well ahead in his matchups. I think he added a huge amount of value to Toronto while he was there.
The non-offensive aspects of Sundin's game seem to really fly under the radar.
The perception of him among hockey types who are into hockey history and all-time rankings and such seems to be that he was an offensive C who was good offensively but was not at the level of the biggest superstars of his era in that regard and that he had only a modest peak offensively for someone who was as prolific offensively as he was while not offering much of note in terms of defense, leadership, intangibles etc. Thus he seems to be thought of as basically a centre version of a guy like Recchi, I guess. Meanwhile, he's perceived to be overrated because of Toronto fans/the hockey media. That's the impression I've gotten anyway.
He was a very solid top line centre during the puck era and he actually brought more than just points. He killed penalties frequently and was strong on the puck and could really be a handful to handle in the attacking zone.
He ranks among the leaders in short-handed points on this list on NHL.com (I believe it goes back to 1934 or so).
NHL.com - Stats
He had some plus/minus ratings that were quite solid in comparison his team's goal differential/the plus/minus ratings of numerous defensemen on his team.
In 1997, he was a +6 despite the fact that his team had a goal differential of -43.
1996-97 Toronto Maple Leafs Roster and Statistics | Hockey-Reference.com
The Maple Leafs' defense was very poor that season, featuring old guys, a beleaguered Larry Murphy and random scrubs.
Yushkevich was -24, Macoun was -14, Martin was -12 and Ellett was -8.
The following season, he was only -3 on another team with a goal differential of -43.
Defensemen Macoun, Yushkevich, Schneider, Wolanin and Zettler were all -8 to -17.
In 1999, the Leafs improved drastically and made the playoffs. They had a goal differential of +37 and Sundin was +22.
From 2000-2004, the Leafs made the playoffs every year and Sundin always had a positive plus/minus rating (+16, +15, +6, +1, +11).
Later on, toward the end of his career, Sundin was +17 on a team with a goal differential of -29 (in 2008-2009).
McCabe was -2, Kaberle was -8, White was -9, Stralman was -10.
I'm not really surprised Sundin cracked the top 100 on your chart. I agree that he brought immense value to TOR and there definitely was more to his game than pure point production.
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Joe Thornton is higher than I would have imagined, but he is a player who could dominate games when he was on during his prime. He's another guy that doesn't have a reputation for being particularly great defensively AFIK but who consistently exerted a team-positive impact on the ice.
Henrik Sedin is surprisingly high, but considering the way he and his brother could control the puck during their primes, I'm not shocked by his ranking.