Level doesn't mean anything
How good a player one is doesn't have anything to do with how good a coach you are. What matters is how well you are at developing players. It just so happens that Coach B was a very high level player but that isn't important. Coach B has developed the two players who are responsible for practically every US Davis Cup win in the last decade. He's also developed a ton of super high quality juniors who have played at various high levels. He's been around tennis for several decades and focused on developing talent. That is different than focusing on using your name to move a career ahead on TV and on the backs of other coaches' players. The US really needs people like Coach B influencing and running US tennis. He deserves the support and attention of the USTA.