This is not my line of Stegall, but I firmly believe the Burrus children "adopted" the Sapp surname(legal or otherwise).
In the pension files, James B. Stegall (son of William T. and Jane C. Stegall) states:
"My mother's maiden name was Jane C. Sapp and she married my father March 1, 1854 in Fayette Co. Illinois, the ceremony being performed by Sam'l Arnold, JP.Neither had been married before.My mother applied for half pay pension (Sec. BJS) Febry 14, 1862 - but it was rejected.She afterwards married Joseph C. Long and died in Fayette Co. Ill. March 17, 1864." ..... "Wm T. Stigall, my father, was a farmer prior to enlistment and lived for 5 years or more in Fayette Co. ILL, 1/2 mile from _____ City.He was ____ so far as I know.Of course I was a small child at the time and the testimony I furnish is from facts learned through my uncle - Isaac Sapp - now at La Prairie, Adams Co. IL and Shelby Arnold - now at Moark, Ark and from general hearsay.Both of these men knew father before enlistment and were with him in Co. C. 6 MO Vol Inf."
The census taken 27 August 1850 was only a year after the marriage of Daniel Sapp and Elizabeth Burrus, and it appears that the children were still known as Buris.It is obvious that in later years they used the surname of Sapp.
Also, if the census ages for Jane C. are near correct, she was only age 15 or so when she married William T. Stegall.So there was really no time for Jane to have earlier been married to a Mr. Sapp.
1840 IL Fayette Co. film 59, page 168: Daniel Sapp000101-21001 Male Female 0-52 5-101 15-201 20-301 30-401
1840 IL Shelby Co. film 70, page 197: Dickenson Burris 012001-21101001 Male Female 0-52 5-1011 10-1521 20-301 30-401 50-601 (Fayette and Shelby Cos. abut)
Daniel Sapp m. Elizabeth Burrus, 4 Mar 1849, Fayette Co. IL
27 Aug 1850 IL Fayette Co., film 106, page 399, dwelling 173, family 173 DanielSapp 48 OH, farmer, $2000 Elizabeth42 VA Margaret19(all OH) Mary J.17 Rebecca14 Nelson13 William11 Melissa9 Robert7 Lurana4 Mahalal Buris16 Mary W.14 Jane C.12 Isaac R.9