Actually, fighting skills do not automatically equate to communication skills needed to teach, or even a deep technical understanding.
Who would you have rather taken boxing lessons from - Mike Tyson the champ or Cus D'Amato?

Buster Douglas.

I dont think it was just Cus D,Amato who trained Mike Tyson.
There were a whole heap of other people involved with their experiences.
Look at the difference in styles between Floyd Patterson
and Tyson.
I dont mean their physical or mental make up.

One of the main communication of boxing skills to Tyson was made by Tyson . He studied the art of boxing as well as being trained.