Have you seen these sites:
http://www.rootsweb.com/~okgarvin/pioneers.html
(William Grant Kimberlin)
http://www.tsha.utexas.edu/mytexas/stories/OO/330.html
(Isaiah "Jefferus" Kimberlin)
Since Isaiah reported being in JO Shelby's Brigade, there's a possibility he was also in Col. David Shank's Jackson County Regiment - 12th MO Cav., Co. D. It could be that he's the "Zaa" Kimberlin listed here: http://www.sos.mo.gov/archives/soldiers/