Jeremy Swayman
I mean, Swayman has been talked about as the cornerstone of the franchise in Boston for years, even since he was playing at the University of Maine, Goaltender Development Coach and former NHL netminder, Mike Dunham, even said that he was "the future of goaltending in Boston."
After the season that Swayman put together, he's primed and ready for a spot on the NHL roster to himself where he gets the bulk of the starts. He did put together a starter-worthy season, and is ready for the next stage.
Right now, don't be surprised if Boston is simply working out the numbers to see where exactly they can meet Swayman. Whether that is saying that they will pay him what he wants given their cap space or meeting in the middle.
What they should do:
The Bruins need to go out of their way to sign Swayman pre-arbitration, or if he even makes it past arbitration match any offer sheet presented to him.