Knoxville Colored High School was formed in 1916. Robert Booker wrote about the history of the Austin schools in a Knoxville News Sentinel column in 2009.
This team photo came from The Echo (vol. III), the KCHS yearbook of 1926.
I think that the coach, O. C. Twyner, was Olger Conelius Twyner. I have found him in the both the 1927 and 1928 Knoxville City Directories.
1927 - Twyner, Olger C (c) (Mary H) sec-genl mgr Western Heights Merc Co r 1817 CollegeThat address today is at College and Jourolman, just north of Knoxville College.
1928 - Twyner, Olger C (c) (Mary H) tchr r 1817 College
Below is his draft registration card for World War One.
| Description: Registration State: Illinois; Registration County: St Clair; Roll: 1613396; Draft Board: 3
Description: Draft Card: T
Source Information: Ancestry.com. U.S., World War I Draft Registration Cards, 1917-1918 [database on-line].
Provo, UT, USA: Ancestry.com Operations Inc, 2005.
Original data: United States, Selective Service System. World War I Selective Service System Draft Registration Cards, 1917-1918. Washington, D.C.: National Archives and Records Administration. M1509, 4,582 rolls.
Imaged from Family History Library microfilm.
I'm assuming that Greeneville College is somehow associated with Tusculum College in Greeneville, Tennessee. Nelson Merry College, an African-American school, was located in Jefferson City, Tennessee. Walnut Hill High? There is a Walnut Hill in Sullivan County, Tennessee. There was a Langston High School located in Johnson City.
baseball images from the Beck Cultural Exchange Center