It's not because he isn't 20ish, it's because he's a detriment to the team. Matheson has been absolutely terrible at 5v5. It's unnaceptable for PO team to have a guy like him. We aspire to be a PO contender next year, Guhle, Xhekaj, Struble, Harris, Hutson, Engstrom, Norlinder and Trudeau are all LD's, that is a lot of organisational depth. Dickinson, Buium and Silayev are top prospects available for the draft, two of which could play next year in the NHL.
Mathesons contract has two years left, he's never produced as much and other teams are going to look at his production and think "I can fix him". If the offer is good, he needs to be dealt. If all that we can get is a 2nd, keep him, but for gods sake reduce his minutes and move back Guhle on the LD top pair.
We can't just keep every single player in a rebuild and get attached to players, that's a good way to become the Wild/Flyers.
Also:
View attachment 851719
Something sticks out here, it may not be an actual top pair D that we have, but what do I know.