The problem is we had four of the worst coaches in the league preceding him. Krueger and his staff definitely understand hockey coaching basics 101. They understand defensive positioning, breakout strategy, neutral zone postioning, and on top of that he has the communication skills to get his guys to buy in. These are all good things and certainly an improvement over his predecessors.
However, I personally think that the really brilliant coaching minds are excellent at teaching their players how to create space and deception in the offensive zone. Whether it's teaching the dmen when to activate, when to incorporate behind the net strategy, or when, where, and how the forwards cycle, quality coaches find ways to break down tight defenses. We're really overreliant on that damn low to high play, which is fine against those collapsed boxes, but our forwards rarely create enough chaos in the crease to make it work, and our dmen have forgotten how to get there shots through.
Look, you're probably right in that there's not many coaches that could do better right now, things are really stacked against this team at the moment; we had the extremely long offseason, then the 2-week break due to COVID, injuries to key players, roster holes on defense and in goal, and we're really young at the most vital positions. On top of that we've played most of our games against tough, veteran, well-coached teams in Washington and the NYI. Krueger is probably good enough to win when the odds aren't stacked against him, but sooner or later the dam is gonna break (again) if he doesn't find a way to unleash the offensive talent here.