Ken: Why do you state Frisco is Old Stonewall, I've got way north on the Chisolm Trail. Current day Ada is closer I believe (Ada 1/2 way between Stonewall and Center)?
I've got the GIS map up and working, It appears that Cochran's has to be on the Middle Boggy looking at the NED geography. Middle Boggy hooks way west at the foot of the Shawnee Hills and is actually only about 3 miles from the Clear Boggy in the neighborhood of Ada. My best guess is Cochran's if you believe the 1869 map and the 1887 Mayo map was about 12 miles east northeast of current day Ada.