Honestly the best teams have good coaches might not be the best but they are defiantly not bad.
They either know how to attract the best talent in some cases and manage a game or, in some cases they know how to develop talent and manage with the talent they have.
With that said...Having been around the game for over 25 years there are a lot of very good coaches that get the most out of their players and are competitive at a variety of levels.
IMO, The only difference between the top 5 teams in each age group and the bulk of the other teams is pitching...
At tryouts teams get ladies that are serviceable-good-very good or, dominate pitchers.
Your upper tier organizations Lasers, Outlaws, Doom, Hawks etc. tend to land at least one dominate sometimes two.