That was a career year for Karlsson. In reality he is a 3C fringe 2C.
And it wasn't necessarily guys buried on other rosters. Reilly Smith was a middle six winger on the Panthers and went on to be a middle six winger.
I'm sorry but the cream rises to the top, and if a player shows enough to get elevated then they eventually move a player out, similar to Fox and ADA.
In fact I could point to other players who are elevated in the lineup simply because they are earlier in their careers and cheap. I would prefer to watch better players than Roslovic get shots in the top six because they're younger and cheaper.
But the more expansion you have the more Roslovic you get. Expansion isn't going to lead to more stars.