I think there's so little info on him because his wife died reltively young. Allegedly his father Dr. Augustin Davis Statham (1804-62) was related to Pres. Davis, but I haven't researched that. He had a brother William Crawford Statham and a son Elliott Winter Statham (b. 1861 d. 1862).
My book will have bios of 1583 full colonels of the Confederate army, line and staff alike. Appendices will inlcude notices of several hundred more state army colonels. I have uncovered exact dates of birth and death for 84% of the colonels, and have at least a year of birth for every one.
As you can guess, you're not the only obsessive-compulsive one!