This one critically important voice in the Celtics’ office says they’re the team to beat: “Celtics managing partner Wyc Grousbeck didn’t want to talk about the collecting bargaining negotiations he participated in Tuesday. But he had no problem anointing the Celtics as the “hands down” favorites in the Eastern Conference next season. ‘I think we should be the favorites in the conference, hands down,’ Grousbeck said after emerging from a 3 1-2 hour bargaining session between the NBA owners and the players’ union. ‘And we’re going to start proving that Oct. 27.’”