Mike Green had a 30 goal 75 point season did he not? Not really sure how you can't say the very exact same thing about him in his prime (but I'm guessing it's because he didn't get that norris). They are the exact same breed of player, lets see if Karlsson can actually sustain it.
I am not saying Mike Green was bad or anything. He was one of the best offensive d-man during his two prime seasons. But during that time he played on a team who came in 1st and 4th in the league, who had the best or second best PP in a time when the amount of PP was higher then just a couple of seasons after. Caps had 337 PP opportunities when Green scored 31 goals but that only ranked them 19th in terms of PP opportunities (Carolina was ranked 1st with 374 PP Opp) but compare that to the 11/12 season when Ottawa had 270 PP Opp ranking them 13th and the leader Philadelphia had 335.
I think that Karlssons best season when he had 78 points is much more impressive then Greens 31 goal season considering he played on a much worse team, the PP opportunities was fewer and that he separated him self from the other d-mans in terms of points in a more impressive way.
09/10 Caps 313 PP Opp (10th) PP 25.2% (1st)
MK, 75 GP, 19 G, 57, A, 76 P (10 G, 25 A, 35 P = 46% of points comes from the PP)
MK was 7 points better then his closest rival (Keith who had 69 points) average for the top 10 d-man after MK was 54 points.
MK spent 379:48 minutes on the PP (2nd among defenceman around the league)
08/09 Caps 337 PP Opp (19th) PP 25.2% (2nd)
MK, 68 GP, 31 G, 42 A, 73 P (On the PP 18 G, 20 A, 38 P = 52% of the points comes from the PP)
MK was 9 points better then his closest rival (Markov who had 64 points) average for the top 10 d-man after MK was 56 points.
MK spent 365:59 minutes on the PP (6th among defenceman around the league)
11/12 Sens 270 PP Opp (13th) PP 18.2% (11th)
EK had 81 GP, 19 G, 59 A, 78 P (On the PP 3 G, 25 A, 28 P = 35% of points from the PP)
EK was 25 points better then his closest rival (Byfuglien with 52 points) average for the top 10 d-man after EK was 49 points.
EK spent 315:31 minutes in the PP (5th among defenceman around the league)