If you feel like Swayman can do 50-55 games and like Bussi for 30, it makes sense to deal Ullmark. He has the most value of the three, and the highest salary. As for Bussi, every NHL goalie was an unproven player at one time (true for almost every single NHL player period). The only way you ever really know what you have in a guy is to play him. It's a gamble, to be sure, but Bussi showed he can handle the AHL just fine and he is an older guy for a prospect- it isn't like throwing some kid fresh out of junior in there.