In a move that had Celtics fans doing a double-take, Joe Mazzulla's Game 7 starting lineup against the Philadelphia 76ers echoed an infamous decision from Patriots lore—Bill Belichick benching Malcolm Butler in Super Bowl LII. It's the kind of head-scratcher that leaves you wondering: what were they thinking?

Let's be clear: Mazzulla is a brilliant coach. He's the frontrunner for NBA Coach of the Year, and for good reason. He's transformed the Celtics into a powerhouse all season long. But when the stakes were highest—in a win-or-go-home Game 7 that felt like a season-defining moment—Mazzulla made a gamble that backfired spectacularly.

Instead of sticking with what worked all year, he rolled out a starting five that had never played a single minute together. It was a move born from overconfidence, a belief that he could outsmart the 76ers with a curveball. Instead, it sent shockwaves through the Garden.

Ron Harper Jr., making just his third career start, played only four minutes and finished with a -7 rating. Luka Garza, getting the nod at center, picked up three fouls in nine minutes, missed every field goal attempt, and left with a -15. Meanwhile, Neemias Queta—the only Celtic with a plus-minus above +5—sat on the bench as Philadelphia jumped out to a 17-6 lead. When Queta finally checked in, he grabbed 12 rebounds and gave the team a spark that should have been there from the opening tip.

Sam Hauser, who started 49 games this season, began Game 7 on the bench. When he finally got his chance, he shot 57% from the field and was one of the few Celtics who could consistently hit from deep. Payton Pritchard, a 50-game starter, also watched from the sidelines (behind Harper, no less) before coming in to dish out a team-high seven assists.

There's no sugarcoating it: this was a lineup decision that defied logic. Mazzulla flew too close to the sun, and Boston got burned. For a team with championship aspirations, it's a painful reminder that even the best coaches can outthink themselves on the biggest stage.