I see the Celtics pushing the pace this year and playing a bunch of fast break offense. That could go a long way to improving the offense that gets set back by having their best mid range jump shooter and best creator of offense leaving.
I see Bradley, Green and Lee being open for a ton of corner threes on the break and I see Sullinger, Humphries, Bass and others being allow to crash the offensive boards for more possessions and easy putbacks, something the Celtics have not allowed their players to do in the past.
So I don't see the Celtics suddenly becoming offensively inept. With Doc's philosophy on offensive rebounding gone and the C's reliance on half court offense due to older players gone, I think the C's offense might actually get better. Maybe less efficientshooting wise(FG%, eFG%, 3PT%) but better overall(more PPG, higher ORTG, higher FT/FGA%, higher ORB%.
The defense without KG though, is going to be a lot worse. He was that important to the defense.