Basketball is a sport of hot streaks and cold streaks, in a game, in a season, in quarter. Rarely is a team "hot" the whole season or even a whole game. There are only 5 players on the court at a time so if one of your best 5 is injured and not playing or not playing 100%, it makes a big difference. All teams have had more than normal injuries or COVID absences this season so this variability is higher then normal. Plus there is an element of chance with every shot. Close games can go either way based on a shot falling or not.
Right now, there is no doubt that the Celtics are the team that is hot, that is putting it all together at the right time, that is "clicking". Even Brown now appears to be past his most recent injury that was slowing him down a bit. We have positioned ourselves to be the team that no one wants to play in the playoffs. But we need to just keep it going. Every game, every quarter, every possession.
I am not that concerned about rest. We don't want to be stupid with playing time but at this point in the season, I say play hard every game, or it could spoil the mojo. Maybe give Al Horford some extra rest but he really looks fine. To me, maintaining the mojo, the momentum, is more important than rest. Someone may get injured. Nothing you can do about that. But they can get injured in 20 min per game or 30 min per game.
Keep this train rolling. Full steam ahead. Don't worry about standings either. Don't get cute and try to maneuver for a particular seed. That could spoil the mojo too.