All the rosters I located listed him as drafted, not a substitute. The term substitute appears on others, however.
William Sole
Residence was not listed;
Enlisted on 10/13/1864 as a Private.
On 10/13/1864 he was drafted into "K" Co. IL 20th Infantry
He was Mustered Out on 7/16/1865 at Louisville, KY
[Civil War Research Database]