The following info should eliminate this soldier as a possible candidate.
Corp. John/Jno. W. Skinner of Company E/40th. Miss. was captured near Atlanta on July 20, 1864.
He was transferred to Camp Douglas in August and died of smallpox on Dec. 19, 1864.
He is listed on the bronze tablets of the Oak Woods Monument.
http://www.graveyards.com/IL/Cook/oakwoods/confederate-names/tablet014.jpg