They need an injection of energy whether that be a new coach or new players. They have low energy, no passion, no fun, they’re the most boring team in the league. Over the years they’ve moved on from beloved “glue guys” like Barrie, Ceci, Yams, McLeod, etc. without considering you need people in the room to keep the mood light and fun. This stretches all the way back to guys lamenting the loss of Matt Hendricks for what he brought to the room.
I imagine being in a locker room dominated by McDavid and Draisaitl, guys who are all-business with a propensity for snapping on teammates, probably feels as fun as a funeral when things aren’t going great. You can get mired in that energy, becoming uptight and afraid of making mistakes, throwing you off your game. Fun is part of the equation of winning.
I don’t think Knoblauch is THE problem but certainly their uninspired play could partially be a reflection of a completely vanilla and emotionless coach.