Nothing tangible ever really came out, or if it did, I missed it. I don't subscribe to any pay services, and am not asking for any protected info, but his departure came out of the blue. Maybe it was a case of MF wanting to bring in his own guy, or Elston simply saw an opportunity to return to his alma mater. But Elston, and his family, loved ND and were not shy about proclaiming it. They were active on social media talking about how much they enjoyed the stability of raising kids in one place.
He did a terrific job for ND, and Michigan. Best to him in San Diego.