While I largely agree that overall progression of a group is one of the best indicator of the effectiveness of a coach, I don't think that even that is a perfect indicator if you have a talent rich stable of athletes. There are quite a few coaches that have taken athletes from 11s to low 10s. I'm not trying to pick on CF because I know he knows his stuff but I really think Ben had more talent than people gave him credit for. The guy is Jamaican for goodness sakes. That's one of the most talent rich nationalities in the world and his slow times early on along with CF's physical description of him indicates he might have just been a late bloomer.
ELITETRACK Founder