Thanks for the kudos, Heath and Roger, and for the better history of the Wesorts, Laurie. I tried to recount what I knew about the Wesorts the best I could but I knew you were more of an expert on them than I.
While I don't know of any pictures of Swann, I think it is safe to say that he appeared more black than white. Col. Wells described Swann thusly:
"The guide is a colored man by the name of Swan, who was also forwarded with his statement"
I just finished a post on BoothieBarn about Oswell Swann:
http://boothiebarn.com/2013/07/26/more-a...ell-swann/