A living male Reeves descendant of John Nelson Reeves just received his DNA test results, and he is a "DNA match" to the descendants of Green B. Reeves and Ambrose Reeves (i.e., DNA "Group 4" at the Reeves DNA testing project). It seems that the researchers of this overall Reeves family are not sure just how those three lines are related to one another (i.e., they have not found "the most recent common male Reeves ancestor" from whom all three of those lines descend).
The above helps to explain why a living male "Davison" descendant has DNA that also matches the above Reeves family. It had seemed that the ancestor of that "Davison donor"....who was named George Washington Davison....was probably a "Reeves infant" who was taken-in, named and reared by a Davison family that was in the same area as the family of John Nelson Reeves (and John Nelson Reeves had a brother who was named George Washington Reeves).