I still subscribe to the once popular outlook that the actual impact of managers is limited. I also agree with "all managers do really dumb things". What he does appear to be quite good at is running a clubhouse that is supportive, isn't toxic and stay out of the way of the guys who develop and scheme to get the most out of the pitching staff. That combined with the resourceful front office results in some players, who otherwise have been overlooked, to find themselves in their best position to have success. That makes Murphy a pretty good manager, in game errors and all.