The first 13 games, having 4 points made sense as he wasn't creating much offense and was spending too much time in the defensive zone. The last 13 games, he's been creating a lot of offense so 6 points doesn't really tell the whole story. He's gotten many more dangerous shots off, has given grade A chances to others that aren't capitalizing (like the pass to Hertl tonight) and has done well on the PP overall. Two of his best games came without him getting on the scoresheet despite creating chances. On the whole of the last 13 games, he's been the best D though the numbers don't look it.
Of course he needs to actually produce more, but he's not the only one that can control that. He's playing less, being passed to less often (including Knyzhov who takes a lot of point shots instead of passing over), and his role is different than it was in Ottawa. Right now, with playing under 23 minutes per game, with touching the puck less, and with the system seemingly not emphasizing his strengths, his PPG is going to be less than it was in the mid 2010s even if he's playing great hockey. Better than .46 that he's had since his injury break, but not like .91 that he had in his prime either. Probably .70 or around there.
Going forward into next season Karlsson needs to be the #1 offensive play driver, and the whole team has to know it. It would be one thing if there was an elite forward, but there isn't. The team needs his offensive skills to be good, just like in his Ottawa days. I don't know if that means Burns has to be traded, or the ice-times they are currently playing reversed where EK is the guy playing 25-26 minutes a night, but whatever it is, it has to be done.
Also, an example of the difference in EK's role: an interesting play from the game tonight. Sharks had a PP and Burns and the 2nd unit started on it, then Karl came on about a minute in, then with about 15 seconds left in the PP, Karl went off and Vlasic came on when the team had possession and another scoring chance to be had. I hate to sound like a broken record, but if Karlsson was really counted on by the coaches to produce offense and be "the guy," there's no way he comes off the PP there, especially after only being on for about 45-50 seconds. Vlasic ended up touching the puck in what would have been a dangerous opportunity on Erik's stick, but no, he was off the ice.