I don't know exactly what you mean by "old African Indian tale," but you are much mistaken about Jake Simmons, Jr. NOT being a descendant of Cow Tom.

Jake C. Simmons, Jr. is the son of Rose (nee: Jefferson) and Jake Simmons, Sr.
Rose is the dau of Malinda (nee: Cow Tom) and John Jefferson.
Malinda is the dau of Amy and Cow Tom.

This info. was well known among most of the "old heads," throughout Creek country (esp. those bet. Muskogee and Tulsa); plus those my elder cousins called, "straight-ears" (state born folk that migrated to IT during the land rush).

The family is very old with pre-removal roots in the old Muskogee (AL) and Seminole (FL) homelands. Moreover, it's huge with familial ties among the Seminole and those that migrated to MX with Wildcat and John Horse. Anyway, this family is practically connected to every old African Native Creek family on the Dawes Rolls, incl. a battery of my forefolk.

For anyone interested:
The title of the book is Staking a Claim: Jake Simmons and the Making of an African-American Oil Dynasty.
Author: Jonathan D. Greenberg

Hope this helps,

Laurel