The Forward Money Won't Save Them If the Blue Line Collapses in October

St. Louis built its offseason around the idea that more firepower up front would finally push this franchise back into playoff contention. The Connor McMichael signing at six years and $40.5 million, the Mason McTavish acquisition, the Dillon Dube addition — management made a clear bet that the Blues could outscore their problems. That bet looked shaky before the puck dropped on the new season. Nine days into camp, it looks like a crisis.

Tyler Tucker's knee injury in practice last week is the number that matters most right now — not because Tucker alone is irreplaceable, but because he is the third defenseman to go down before October arrives. Brandon Carlo, brought in specifically to bring size and experience to a blue line that had none, has no clear return timeline. Matthew Mayich, the defensive prospect whose family opened up to Elliotte Friedman last week about his condition, collapsed in August with exertional heat stroke and remains in a fight that has nothing to do with hockey. Three defensemen, three different circumstances, one brutal common denominator: the Blues are going to open the regular season with a thinner blue line than they had when the offseason began.

This is not a new problem wearing a new costume. Last season, St. Louis allowed 3.1 goals per game over its final ten games even as the offense was surging to 4.0 per night — a paradox that cost the team a playoff spot for the second consecutive year. The front office understood the diagnosis. What the offseason response revealed, though, is that management prioritized the part of the team that wasn't actually broken. Robert Thomas put up 38 points in 45 games last season and was already the engine this offense needed. The Blues went out and added more forwards around him. Meanwhile, Cam Fowler — who finished last year at minus-20 — is now one of the veterans the defense is leaning on most heavily, and he has openly said he let people down. That's a man trying to reclaim something, not a foundation.

The depth chart behind the top pair is not comforting. Theo Lindstein and Logan Mailloux are the names behind Philip Broberg in the organizational queue, and the Blues just sent another wave of bodies to Springfield to trim the camp roster toward the 23-man deadline. Justin Carbonneau, the 2025 first-round pick, is among those heading to the AHL. The cupboard is not bare, but it is not stocked for a multi-defenseman emergency either. My read is that if Carlo misses the first two or three weeks — which is entirely plausible given there is no timeline attached to his recovery — St. Louis will be asking young players to absorb minutes they are not ready for against opponents who will absolutely target that vulnerability.

The historical precedent here is not encouraging. Teams that enter October with defensive injuries at this scale and this depth tend to dig holes they cannot climb out of, regardless of offensive talent. St. Louis knows this firsthand: the 2025-26 season opened with a 3-8 October, including a seven-game losing streak, and the team never fully recovered its footing until March. The offseason was supposed to prevent a repeat of that start. Instead, the Blues are about to find out whether a forward corps built around Thomas, McTavish, and McMichael can compensate for a defense that is already down bodies before the first meaningful game. History says it cannot. The Blues have until Monday to set a 23-man roster. The answer to whether they have enough defensemen to survive October will come faster than that.