To the bold, because that would be worse than what we showed last season, and you're not making any real arguments as to why you think we would dip like that other than "4 players making half the cap" which has already been a thing for 2 seasons now, or "Andersen will somehow be worse".
For the rest, coaches are a part of the team too. They are responsible for lineup decisions, pregame preparation, in game preparation, and on the fly adjustments during play. It's not a coincidence that we started playing a lot better once Babcock was fired. His coaching decisions during our last series vs Boston were comical especially during Game 7, along with the start to last season, it was clear that he wasn't the right guy for the job anymore. It's not as simple as "the players gave up on him and were just coasting until he got fired".
So therefore, I choose to look at Keefe's record for this team going forward.