I know a world famous coach who coached a marathoner from 2:40 to 2:27 in just ten weeks, but then the athlete dumped him, and in the next whole year the athlete only improved 2 minutes and didnt go grovelling back to the magic coach.
My quesiton is; 'how bad is the BO of this coach that the athlete should dump him despite such amazing results???'
I would accept a lot of BO for a 13 minute marathon pb improvement in 10 weeks. Like Canary Wharf stink level.
or even BOP Parker. ee by gum.