The former Associate Pastor didn't like recruiting, apparently didn't delegate it, and wasn't good at it. Their lesson plans were above average. By all accounts the Model was well-received by the congregation and liked by many volunteers. Their attendance was better the first year than the second. Some new ideas just do.
All creation is subject to frustration.
Their traditional model attendance now is lower than it was with Rotation. Some of the creative teachers who helped launch Rotation feel somewhat abandoned. The Associate Pastor has left the congregation due to problems unassociated with Sunday School. I'm sure there are other ingredients. Any of us would be lucky to have just most of what's on this list.