The Celtics last season was a Jekyll and Hyde team. The loss against OKC (Rondo's suspension) was the turning point of the season, and it probably would have been regardless of who the starting sg was.
But we needed ubuntu at that time, people sacrificing themselves for the team. Avery did that by playing his relentless defense. He believes that he can get the team going, by doing that, and that's one of the reasons it is great to have him as a starter. That kind of energy should set the tone for the game, not come off the bench. On the other hand, we also needed someone to make buckets for our bench, and we had noone better for that role than Ray. So he made a sacrifice, too, just as KG gave up his opposition to play center. And Rondo took on the responsibility of being the floor leader, in a way he had never done before.
Maybe the invidual contributions seemed small and can't be seen in the box score, but it was a great team effort that turned last season around.