Toronto not wanting to pay to move any of their players shops Rasmus Sandin's signing rights. Very few teams have the 2+ that Sandin wants in contract, so what teams are willing to pay is depressed. Seattle can use another Defenseman and will have the cap space to sign him once they solve their goalie situation. They send Toronto back their 2024 3rd round pick for Sandin's rights.
Toronto keeps the core together and runs a skeleton crew, not spending any draft picks to move contracts, and tries for another kick at the cup in 2022-2023, calling up depth 750k guys when injuries occur, and hoping they have enough of them to clear waivers when sent back down.