This is so just so wrong on so many levels.
Karlsson has more points because he simply a much, much more talented dman offensively.
Offensively, he is head and shoulders above the rest, even if the point totals are in the same stratosphere this season with the other top offensive dmen.
The coaches know, the players know, and most unbiased analysts know that Erik Karlsson does things that no other dman in the league is capable of. Point totals and hockey sense aside, he will skate through your entire team if he is allowed any space, and has the hands to keep up with his million dollar legs.
It's a game changer, and he can consistently take games over like only a small handful of guys in the league can. He's easily one of the most feared players overall, and that's why he's going to likely win his second Norris.
One thing I find interesting is how people point to zone starts as a reason that Karlsson has some form of advantage.
Most research has shown that the advantage or disadvantage lasts about 10 secs, and is primarily only attained on a faceoff win, the effect of a faceoff win can be seen in the graph below:
Here's the funny part; for all the bemoaning Karlsson's unfair advantage because of where he starts his shifts, here's where he ranks in raw numbers according to behind the net (note that they don't seem to have updated lately, so we are missing some games):
Here's where he is in OZ face-off's where his team won the draw (most advantaged situation)
RK|NAME|GP|Off Faceoff Wins
1|RYANSUTER|71|308
2|KEITHYANDLE|77|282
3|P.K.SUBBAN|75|271
4|DREWDOUGHTY|76|266
5|JUSTINFAULK|74|264
6|MARKSTREIT|75|263
7|SHEAWEBER|71|256
8|ROMANJOSI|71|256
9|BRENTBURNS|78|251
10|ERIKKARLSSON|73|249
11|ANDREIMARKOV|74|247
12|MICHAELSTONE|75|238
13|DUNCANKEITH|75|236
14|RONHAINSEY|73|233
15|NIKLASHJALMARSSON|76|232
16|JAKEMUZZIN|70|230
17|ALEXPIETRANGELO|77|229
18|JOHNODUYAODUYA|71|228
19|ALEXGOLIGOSKI|76|226
20|KRISRUSSELL|72|226
Notable players getting more advantageous situations: Doughty, Subban, Suter, Josi, Weber.
And here's where he is in DZ face-off's where his team lost the draw (most disadvantaged)
RK|NAME|Def Faceoff Loss
1|ROMANJOSI|319
2|SHEAWEBER|314
3|T.J.BRODIE|288
4|TYLERMYERS|263
5|DANGIRARDI|262
6|ANDYGREENE|262
7|ERIKKARLSSON| 251
8|ALEXANDEREDLER|245
9|DREWDOUGHTY|244
10|NIKLASHJALMARSSON|244
11|RYANSUTER|244
12|DENNISWIDEMAN|244
13|MARCSTAAL|240
14|KRISRUSSELL|236
15|JUSTINFAULK|235
16|RASMUSRISTOLAINEN|231
17|ALEXGOLIGOSKI|230
18|OLIVEREKMAN-LARSSON |229
19|P.K.SUBBAN|227
20|MARKGIORDANO|227
Notable players with fewer starts in the DZ where his team loses the draw: Subban, Suter, Doughty.
Now, I'm not a big proponent of zone starts. Their effect is generally overexagerated by the masses imo (and the above illustrates nicely why), but if you are going to suggest that zone starts put Karlsson at a significant advantage, I'd suggest face wins/losses put have him at an equal disadvantage.
I laughed harder at this than I should have. 
