Mystery Photo from Logan Co., KY Civil War Period

This was found in our Family Album from Logan Co., KY. It was taken by Hefner V. Elrod in Frakfort, KY (opposite Major Hall).

We're not really sure of the identity of the gentleman in the photo but the resemblance to our family is unmistakable.
He could be a Hezekiah Robertson, Smith Harper or Samuel Eddy. All would have been at that age at that time.