The connection between Riley's and Thelma is pretty thin, other than both being located in Detroit, and that Joey King Fish worked for both companies, and I believe that Melvin Davis worked on a few recordings for both companies. But, if you recorded in Detroit in the mid 1960s, you were more or less forced to use at least a few musicians that other small R&B/Soul firms were using. Joey King Fish was Diamond Jim Riley's main A & R man for a few years, while he wrote songs and produced several sessions at Thelma, but was less important there (as they had Don Davis, Norman Whitfield, Don Juan Mancha, Clay McMurray and James Gopphine producing as well). Although, he DID lead their in-house band during much of their existence, and took over as A&R Man and chief producer when Davis left the company for Golden World.