I sent you an email from my main account, daniel -at- txmountaineer -dot- com. I didn't know about John until recently, but I suspected his existance based on the Lewis Smith entry in the 1830 Wilkinson Co, GA census. My ancestor is Edwin James Smith, John's younger brother. Send me an email and we can exchange information!
By the way, I'm living in Fort Worth, TX and recently made contact with several of the Hendrix family still living in Bastrop Co. I believe that I know where Elizabeth & Louis are buried, but I don't have much information on John.