I think you may be wrong on your OAC history. Wittenburg left the OAC along with several other schools to create the NCAC when D3 was formed in 1984. Mount's success in football didn't start until the early 90s. The only school that left the OAC in recent memory is Hiram when they joined the NCAC and they were replaced with Wilmington. The OAC is one of the oldest conferences in the country and is still going strong even with Mount's success on the football field.