Perhaps too much emphasis on weights and drills? As shown in this video from back in the day (2009).
http://www.flotrack.org/video/70443-Chris-Lukezic-Workout-EZ-Day
Quote from the vid:
"Chris Lukezic has done basically the same thing every Monday for over 5 years. Chris let us see what a typical Monday (EZ Day) is like"
This seems pretty intense for an "EZ day" and it seems like this work would be better spaced out over multiple days.
I'm not sure about Henner's track record with other runners, but I wouldn't be surprised if she has contributed to the burnout of others. This kid was the third best U.S. talent of the past 15 years, just behind Webb and Ritz. Anyway, just a theory, Henner is obviously a great coach and no disrespect meant to her.