Yeah, Jon Horton was a play-by-play guy for Global and USWA (using the name Craig Johnson).
Was the Mid South he's asking about run out of Lousiana? I'm drawing a blank. I vaguely remember a promotion calling itself Mid-South run from LA. The booker was John Horton, but he wasn't the promoter. Not even sure John Horton and Jon Horton were the same guy. Time frame is rightish, though.
FYI: Jon Horton got out of the wrestling biz and has a job in Hollywood. Last I heard, he was shopping around a sitcom (don't think it ever got made, though).