A good teacher could become a good coach.
The biggest challenge in the sport is keeping the athletes motivated, confident and focused.
The actually 'technical' side of coaching is generally something invented by running dorks and bad coaches to make themselves feel better.
I think a lot of people over-complicate things because they don't like the feeling that running ability is very much decided by talent, so they think that finding a 'magic training bullet' will somehow propel them to greatness.