Several problems with that estimate. First off virtually all of those six decisions a game are so basic everybody makes the exact same choice. Pulling Mat Garza last night was a choice. Yet very few would not have done so. So your 6 per game number is already on suspect ground. When you break it down to the choices that are actual choices I'd say you are lucky to have one per game. Of that most do not effect the games outcome. I seriously doubt the number of choices that are not garden variety everyone makes the same choice and could effect the outcome of the game it averages out to be one every other game. It's probably closer to a couple a week. but for the sake of argument, not to mention doing math in my head, lets assume one every other game. At that rate you are down to 82 choices that matter over the course of the season. Now even the worst of managers do not make the wrong choice every time. So lets say he makes the wrong choice 75% of the time. That is a lot but for the sake of argument lets go with it. That brings us down to around 60 bad choices per season that could effect the game. Of those 60 bad choices many of them turn out well while some of the good choices don't. My guess is the best of choices have a 60% rate of working vs 40% of the poor choices. So the difference is about 12 choices a year that might actually effect the outcome of a game of a really terrible strategic manager vs a great one who makes all the right choices. If you really want to go there, since no manager makes every choice correctly, we should compare them to good managers, not a hypothetical one who makes every decision correctly. Lets say 75% is a valid number of correct choices to be considered good. That leaves us with 8 games where a good strategic manager makes a difference from a terrible one. But that also assumes those decisions that do effect the game come in the games when they are facing a manager who makes the right choices. What are the odds that the few times a year a bad choice that matters will coincide with the other manager making the right choices that turn out well? While my numbers are not meant to be scientific I think it does show the idea that a manager's choice actually matters around six times a game is suspect at best. All in all I'd say managerial decisions are so far down on the totem pole of managerial success as to be irrelevant.