"I walked in and met with Joe (Mazzulla) and Brad (Stevens), and I just said, 'I know one thing: we're not bringing this team back,' shared Grousbeck.
"That was over the summer. It was two years in a row of really good teams that fell short, and in my view, they were inconsistent. We were hot and cold, high and low, and we lost. And we lost to two good teams, the Warriors and the Heat, but we lost. And I just said, 'We're not bringing it back; we're not running it back, period. That's my decision. Now, you tell me what changes we ought to make, guys, or let's do it together. But I wanted their recommendations. And so, I said it out there: we're not bringing the team back, and we didn't bring the team back. Did I know we were gonna get (Kristaps) Porzingis and (Jrue) Holiday? No, I did not. Is that the genius of Brad? Yes. Brad is unbelievable and deserves all the credit in the world."
https://www.si.com/nba/celtics/video/tired-of-celtics-playoff-inconsistency-wyc-grousbeck-decided-were-not-running-it-back