It appears I may have stepped into a flame war. Nonetheless, here's a possible explanation for why a Black elder in rural Alabama chaired Ray's Judicial Committee: demographics.
I think it's beyond doubt that African-Americans are over-represented among JWs in the USA. By that I mean their percentage among the population of Witnesses exceeds their percentage among the general population. Black people make up about 13% of Americans, but according to the 2008 Pew study they make up about 22% of Witnesses. Thus, they're over-represented.
Anecdotally, I've observed and heard that this is exaggerated in the deep south--particularly in rural areas with sizeable Black communities. For example, once upon a time I had a conversation with a "worldly" person from such an area and he was surprised that I was a JW because he thought it was a "Black religion." (I'm a ghost, so obviously I'm white ;)
Again, I don't have specific knowledge about Gadsden Alabama, but it could be one of those cases where the congregation has a sizeable African-American population. In such a case, it would not be surprising that there would be several Black elders and that one of the Black elders would end up chairing Ray's J.C.
To me, that seems like the simplest explanation for all of this.