If only Bergevin can add some guys to have a somewhat offensive 3rd line, he would be a perfect physical/shutdown 4th liner and Pker. And he can obviously play on the 3rd line if there are injuries (and there will be, sadly).
I think Bergevin started talking to both Price and Subban before any words on Moen's negociation started. And like BobBarker said, he's a UFA the other twos are RFA.
Moen is a very good asset, he skates well, he's tough, can play PK and cares about the team. Having a guy who can fight heavy weight, play awesome PK and be useful on a third line is hard to come by. At the TDL every fans from other teams were inquiring about him before any other players on our team, that says a lot.
Sure, I just see it this way: There's going to be negotiations with PK & Price after all and they haven't accepted whatever offer was sent. Then a question comes: Is it going to be a long summer for these 2?