Yeah, being -8 in terms of offensive rebounds hurts, because that's a lot of second chances for the Cavs. Between that and losing the turnover battle, we gave the Cavs 10 extra possessions that we didn't have. That makes it hard to win.
Bass, Zeller, KO, and Sully combined for 9 rebounds (1 offensive board) in 74 minutes. They've got to do better. It probably won't make a huge difference, as we're outmatched in the series, but a bit more effort on the boards is an area where the Celts can improve.