First, one of the local TV stations had on their web site that he was told that there was going to be a change in a different direction. Oftentimes, especially in the business world, the word is that they "retired', left to pursue an other opportunity", and so on.
Second, point #2 could be the big reason. Compare these three schools and city/town's populations. Avon, a town, is now estimated at around 23K, Brownsburg, also a town, at estimated at 32K, and Wesfield, a city, is now estimated at 51K. Now look at the school enrollments. Brownsburg's is 3,464, Avon's is 3,476. Westfield's is 2,960. That tells me that either Westfield is a much older community, so fewer kids in the schools, which it is not, or there are a lot of kids from other areas, particularly Wayne Township driving across the county line to Avon and Brownsburg.