I don't beleive I am much help at this time. I only show three McComas in my files. Henley McComas Born 1804-1813 pos. in Virginia and He married Mary J. Kibler. Wilson McComas born 1877-1886 and married Sally Moore and had a child Thelma.
I did check land records for Rush Co., Indiana and found a Nathaniel McComas that had brought land 3-4-1822 at Brookville, Franklin Co., In. As far as the Wright's goes Amos Wright 1-31-1831 in Rush at Indianpolis Dan Wright 4-10-1824in Rush at Brookville 12-10-1821in Rush at Brookville John Wright 3-20-1823 (2) in Rush at Brookville Nathaniel Wright 12-10-1821 in Rush at Brookville Thomas Wright 7-10-1823 in Rush at Brookville
The Nathaniel McComas looks like a good chance. I will Check again when I good to the Library.