This series hasn't been great for the Sharks possession-wise. Through the first six games of the series, San Jose's even strength, score-adjusted corsi for percentage (ESCF% in this piece) is 49.92. That number took a serious hit after game six as the Predators led in ESCF 67.401 to 44.498, by far the most lopsided game of the series.
The Sharks played quite well in the first period of game six but after jumping ahead 2-0 they allowed the Predators back into the game. That puts it too simply, as Nashville may have adjusted its own game to work back into the contest, but the possession chart tells a pretty damning story about San Jose's game plan.