There's one thing missing from the discussion of what is missed without KG on the floor.
Along with the defense, intensity, intangibles, height, etc..., one of the most important things he brings is ball movement.
BALL MOVEMENT!!
The Celtics didn't move the rock around yesterday. So, along with replacing his leadership on defense, someone's going to have to step up and remind the team how to pass and play as a team on offense.
Not everyone had a bad game in this sense, but the team as a whole failed in this aspect.