Probably true, I just don't see any 'plan B' that's nearly as impactful. I don't think anyone in the NHL thinks "oh, the Sharks are a scoring winger (of all things) away from being truly scary." Tavares would have given them certain center depth. Now they have Couture and Tierney and several others who rotate in like Pavelski and Hertl...it's nice to have the moving parts for flexibility, but who is going to lock it down? And not one of those guys is remotely like Tavares. Couture is a Carter-level guy, Pavelski is great but he's slowing down.
But yeah if they got Panarin he's the type of impact player who says "I don't care who my center is" like Kane so that would be a good one.