because black gospel is a melting pot of influences. there are no clear cut artists/players to draw from. it's a mixed back of funk/rock/jazz/r&b. there is no definitive black gospel style guitar. you have to draw from different influences and make them your own....then apply what you know and can play to the music you are playing.
Not to mention that black gospel is DOMINATED by organists playing in styles that leave very little linear (fills, etc) space and vertical (sonic range) space for guitars to fit into.