Its quite clear that many many athletes that left recently did not do so due to the Shelby incidence but because Jerrys training left them perpetually injured or underperforming. Quigley said that in a podcast a few months ago and so did Kate Grace & Marielle Hall. They all want to change their training from the rigid Jerry plans to a more personalized plan that fits their needs. Kinda crazy that a coach at that level does not know how to deal with individual runners and just puts one schedule for all and if you cannot follow that schedule then he doesn't care. For those that could handle the plan (Schweizer or Frerichs) it tended to work out great but if you could not handle it then it must have been so frustrating. I mean he got called the "benevolent dictator" by others. For real. That is all you need to know.
That to me is at the base of the whole issue and has caused the mass-exodus. Everything else is circumstances (like team dynamics and shelby etc) that also did not help.