You are correct to an extent, the Sharks were actually missing three puck moving dmen last night. There really isnt a team in the league that could deal with that much better than the sharks did last night. That said, I think they did an admirable job because most of the dmen were a bit out of their element.
Without Boyle, with Burns and Demers I dont think we see such a struggling breakout. What Boyle did show is that he controls that powerplay better than a lot of people think.
what boyle/and to a lesser extent burns brings to the power play is respect on the blue line. power play with boyle other teams just can't leave the blue line unmanned and put all there time and space onto thornton/marleau/pavs/couture. knowing that one pass back and boyle will make them pay.
without boyle/burns teams can double team thornton on the power play.