First I'd like to Thank everyone for their response. Long in the tooth is quite right! The picture of the stone says that he was with Quantrill (if you'll refer back to my original post for the URL). I cannot say for sure that this George W. Rider has been properly identified, nor can I say that this is definitely him. Having incorrect data on stones is nothing new either.
I do believe that I can safely say that this George and I are not related, however, it seems that some of his children (or close kin) may have married into my allied families (per information from the databases). I see MOORE and HOLLOWAY... Thanks again. ~don