Hello Alan,
I too have begun to wonder now. I am mature enough and love history and its integraty enough to admit perhaps there was some mistake made long ago, a typo error or what ever. For the sake of accuracy and the integrity of history I am going to contact the author of that book about it and ask him for more definative sources and search elsewhere. I am contacting some relatives in the hopes they have some answers. Also, someone posted the following on another thread and board. But now I still wonder about it all and will seek truly definative info and let you know if an what I find. Thanks for bearing with me in all this. Please let me know what you think of the following that "Johnny Reb" posted on the "Maryland in the Civil War" Board:
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NPS Civil War Soldier & Sailor System shows:

A.L. Middleton
Regiment Name General and Staff Officers. C.S.A.
Side Confederate
Company
Soldier's Rank_In Asst Surg
Soldier's Rank_Out
Alternate Name A.K./Middleton
Film Number M818 roll 17

Washington, D.C. City Directory, 1890
Name: Alexius L Middleton
Business Name: Insane asylum [St. Elizabeth's]
Occupation: attendant
Year: 1891
City: District of Columbia
State: DC

unproven on-line genealogy shows:

Alexius Llewellyn Middleton
Born: 4 Dec 1833 Bryantown, Maryland
Died: 8 Jan 1906
[son of Alexander Middleton Born: 12 Aug 1790 Bryantown, Charles Co., Maryland Died: Dec 1862 Bryantown, Maryland
and Mary Ann Thompson Born: 23 Nov 1797 in Bryanstown, Charles, Maryland Died: abt 1822 in Bryanstown, Charles, Maryland]
Marriage: 2 Jul 1867 in Prince Georges, Maryland
Ada Pauline Parker
Born: 1845 in Piscataway, Prince Georges, Maryland
Died: May 1894 in Prince Georges, Maryland
Children Sex Birth
Olivia Attawa Middleton F 4 Apr 1868
Joseph Parker Middleton M 1870 in Piscataway, Maryland
Alexander Farnklin Middleton M 22 Aug 1872 in Conway, Arkansas
Spouse 2
Alzine Sarah Berry
Born: 1852
Died: 1939