How Will the Celtics Get Past the Cavs this Year?

Can we agree that the Celtics aren't as good as they were last season? -James Posey, -PJ Brown. Many of us have seen Kobe and Lebron light up the Celtics so far in their 2 meetings this season. They no longer have Posey to put on these guys, and when the big 3 aren't on the court, the bench loses the lead. The Cavs are clearly a better team than last season with Mo Williams in the mix. Come the playoffs, should the Celtics and Cavs meet, how will they be able to stop Lebron from running all over them again like he did with a Big Z less Cavs last meeting, especially since they won't have the luxury of having a James Posey?