Daniel or Thomas Callahan/Callihan

This picture is believed to be one of the sons of Cornelius Callahan and Father of Isaiah Wells Callahan/Callihan. It was obtained from a granddaughter of Agnes Grace (Callahan) Wilson. The photo was a part of an album "Owned" by Isaiah Wells Callahan, son of Daniel and Nephew of Thomas.

The picture was taken by Theo. Brown - Mt. Gilead, Ohio, which is the county seat for Morrow Co., Ohio. The Callahan's lived near Mt. Gilead.

The mystery is to find proof of the identnification of the person in this photo. Based on my analysis: Since the picture was kept in an album "Owned" by Isaiah Wells Callahan, son of Daniel & Grandson of Cornelius, I believe it to be that of Daniel Callahan.

Does anyone with a "Callahan/Callihan" Ancestry have more information to provide proof of the identification of this person?