Because their current starter is Martin Jones...drops keyboard and walks away.
Jones is terrible and untradable, sure. But Dubnyk is worse than Dell, so ... still not an upgrade.
It's not just his last year either (which was awful by any standard). Dubnyk's raw save percentage figures over the previous 3-4 look pretty good but when you adjust for shot difficulty / expected goals he's actually been below average for a long time. And now he's 34.
Sure, goaltending is voodoo and there's always a chance he bounces back, but I have a bad feeling Dubnyk is going to get exposed very, very badly in San Jose.