Why Boston Wins!
Boston has arguably the three best players in the series.
The Pick and Roll in the half court will destroy with Russ and my two bigs. Washington's guards will have enough issues fighting through screens let alone trying to recover to handle Russ. Not to mention Marc Gasol in the post dishing to cutter like Blake and Russ. Russ and Blake will take advantage of the poor pick and roll defense of Pau Gasol, who is guarding Blake.
Washington has a lot of inefficient shooters. And this will help with the transition game of the Celtics. Russ and Blake will be running a lot.
Also my Big three are playing 38-40 minutes which offsets Depth entirely. They will be playing against backups a lot.
Lastly talent prevails in this series in which the Celtics have HCA. Too much top tier talent compared to that of the opposition and this ultimately prevails in the end. There is no matchup that Washington has that you can say, "OK clear advantage Washington and this is why they pull the upset without HCA."