John Brzenk was asked about how to get better at arm wrestling and if weight training would help. Nope, just do arm wrestling. Apparently weight training didn't help him except to give him a bit more endurance when there were heaps of matches.
John was/is the best right arm champion ever and was great with his left but not always the best with that hand. For anyone to have beaten both Dean and Brzenk they must have been great arm wrestlers themselves and Keith was one such guy.
I guess Keith saw a lot of crap behind the scenes in arm wrestling so he sure can spot it when it happens in bodybuilding. It must have been awful to beat great champions and then have someone come up and tell you there was some 'infraction' and you lost the match. If it happened a few times that would be enough to walk away from the sport.