The Frisco in Pontotoc County is just northwest of Stonewall and southeast of Ada. I hadn't heard of the one near OKC before. Search maps.google.com for "Frisco, OK" and it will go to the one in Pontotoc County.
The articles in my other post showed some more mileages to incorporate into your analysis. In particular, the letter to the Clarksville Standard, presumably by Col DeMorse, gives mileages from Ft Arbuckle to Cochran's and other points.