We've discussed this on the podcast and a few people have pointed it out here.
1) The biggest advantage Mike has is he is in Flagstaff. That is where the runners want to be and train.
2) Mike was already a college coach when he started coaching pros. They came to him and had to adjust to his schedule.
Whereas with Jerry, he was coaching pros. They were his sole priority. Then it became, "Hey I'm taking the Oregon job, by definition you can no longer be the sole priority, we're moving, and you're second fiddle in regards to usage of facilities etc."
It makes sense athlete who signed up for Jerry under sole priority scenario might change.