Without having a thorough understanding of the details of their strategy, all I can say is that what they are doing hasn't been working for years now. Watching the Sharks trying to clear the zone and watching other teams attempts, it's pretty clear whatever we are doing isn't working.
The Sharks overly favor the boards up the left side. At one point, they brought the center deep to wind up and come hard in support. They are too single-minded and choose safe more than almost any other team. The defensively stifling opponents have caught on and are waiting for that left boards exit, in force. Even when they brought the center deep, those same teams would designate someone for the center. The Sharks need to use the right and weak side more often. They used some middle to start the year with direct passes to the skater taking the center role; they aren't doing it much. Center deep wind up requires skating and is best done by faster skaters. Fast isn't the Sharks. I have watched Goc do windup for ages and he is really good at it. There are many centers who are. Gomez used to be a king of it.