When he arrived in San Jose for training camp, he felt healthy and at home.
"I think last year was a unique year," he said. "It was different. It was something I hadn't gone through before and didn't think I was going to have to go through. But you know, it's in the past now, and I think that I learned a lot from dealing with that experience, and this year probably feels a little bit more normal.
"I've been here for a year. I know most of the guys now pretty well. A lot of things that I had to worry about last year I don't anymore. It's just coming a little bit more automatic. So yeah, that feels good. But again, I think that the learning experience that I had to go through is going to help me become a better man and a better player."
The Sharks look different than they did in the playoffs. Gone is forward Joe Pavelski, who had spent his entire 13-year NHL career in San Jose and was captain. Also gone are forwards Gustav Nyquist and Joonas Donskoi, and defensemen Justin Braun and Joakim Ryan.
"I know we lost a few bodies, which happens to every team, usually," Karlsson said. "We've got to try and evolve a little bit maybe. I think that even the things that we do well can still get better. We've got to keep pushing for that, I think. We have a full year here now to try to build on it and figure it out for when the time comes when you know every game matters a little bit more."
Karlsson will matter a lot.
"He's going to be a huge key for us," DeBoer said. "When he was healthy last year and used to our system and how we want to play, he was as good as there was in the League, and our team was a reflection of that, because he makes other people better.
"So, he's moving effortlessly. He's got no issues with any of the injury stuff that he dealt with over the summer. It's a good sign for us."