I don't know why people compare eras. You can't. It's like saying the U.S. Army of WWII would have beaten Napoleon's army. Well no ****. But you shouldn't be judged against people you never competed against. That's not how it works. If you're Valedictorian of your class, they don't compare you vs. subsequent valedictorians. You were the best. Your race is over.
Think this through though.
5 defensemen have scored 100 points in a season.
Orr 5x
Coffey 5x
MacInnis 1
Leetch 1
Potvin 1
in 1970-71 a 22 year old Orr put up this stat line
| 78gp | 37g | 102a | 139pts | 91pim | +124 | |
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Plus 124.
In a season. Call it a garbage stat if you want. That's crazy.
For what it is worth, if you divide the league in 70-71 into the Original 6 (NYR, Chi, Mtl, Tor, and Det), skipping Boston because Orr played for them, and into the Expansion 8 (because this was the first year for both Buffalo and Vancouver), you can break down Orr's stat line
Total - 78 Games, 37 Goals, 102 Assists, 139 Points, +124
Total per game - 0.474 G/1.30 A/ 1.78 P
vs the O6 - 30 Games, 11 Goals, 35 Assists, 46 Points, +42
Per game numbers .366 G/1.16 A/ 1.53 P
vs the Expansion 8 - 48 Games, 26 Goals, 67 Assists, 93 Points, +82
Per game numbers .541 G/1.39 A/1.93 P
Now I'm taking nothing away from Orr's stats, even his stats against Original 6 teams are great for a defenseman. But if you look at his team splits for his entire prime in Boston, and turn them into per 82 game averages, you get these numbers.
Games | | | Goals | Assists | Points |
298 | vs O6 | /82 | 27.79 | 66.87 | 94.66 |
233 | vs E1 | /82 | 35.90 | 92.56 | 128.45 |
90 | vs E2 | /82 | 51.02 | 95.67 | 146.69 |
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There have been 16 player-seasons in NHL history where a defenseman has gone 25+65, 6 by Orr, 6 by Coffey, 2 by Potvin, and 1 each for Bourque and MacInnis, so Orr's numbers if you extrapolated his games just against the O6 would be historic. But the games against the expansion franchises are the ones that turn them into legendary numbers.
Edit: E1 refers to the Flyers, Kings, Penguins, Blues, North Stars, and California Golden Seals. E2 refers to Sabres, Canucks, Atlanta Flames, Islanders, KC Scouts, and the Capitals.