Salazar has had Ritz PR twice this year - 2:09:55 off 3 months training, and then 2:07.
Salazar is the best coach in the US from 1500m - marathon.
First, 2:09:55 was a 5-second PR. Don't get too excited about that.
The fact he improved less than three minutes in five years is actually pretty bad, and he is still underperforming in the marathon.
Salazar might be the best 5/10 coach out there. He clearly has not figured out the marathon. Arguing otherwise just makes you like silly.