The most important thing about Jayson Tatum's Game 1 was how little the game seemed to bend around his comeback.
That is the real alarm bell for the rest of the East. Boston beat Philadelphia 123-91, Tatum put up 25 points, 11 rebounds and seven assists, and the night never had the strained feel of a team waiting for its best player to rediscover himself. It looked normal. For Boston, that is the best possible outcome. For everyone else, it is the worst one.
Achilles returns are supposed to invite caution, qualifiers and a lot of scene-setting. Tatum even supplied some of that himself by saying he is still rehabbing and trying to ramp up. But the box score and the game flow cut against the idea that Boston is still in some fragile transitional stage. If a player can deliver that line in his first playoff game since the rupture, then the baseline is already high. The theoretical better version can wait. This version is already enough to tilt a series.
What made it sharper was the context around him. Jaylen Brown scored 26. Boston made 16 threes. Joe Mazzulla was comfortable enough to use 12 players. That is not a team surviving on adrenaline from one emotional return. That is a team functioning at full ecosystem level while its centerpiece says he is not fully there yet.
Philadelphia's side of the game only reinforced the point. The 76ers talked afterward about offering too little resistance and letting Boston get too comfortable. That is exactly the concern. A compromised star can still be hunted. A star who already looks this stable, inside a machine this intact, changes the math of the series fast.
So the takeaway is not simply that Tatum made it back and played well. It is that Boston may have skipped the part where opponents get to tell themselves there will be a soft opening. If this was the ramp-up game, the ceiling arrives sooner than anyone hoping for Celtics vulnerability would like.