And that's why Brad Stevens is smarter then a lot of us. Because while it has felt like the starting unit has struggled at time, just like he's said, they actually haven't had any real difficulties getting out of the starting gates: The Celtics have actually had a lead at the end of the first quarter in both games (1 and 4).
For whatever reason, whether that be adjustments by the Cavs, a drop in intensity, etc., The Celtics starting lineups problems seem to surface in the third quarter where they've been outscored by 13 total points.