Sorry, I know of no living Kimbrel cousins, male or otherwise. The Kimbrels named in my original note are found in my family tree only for one generation in the 1800's, and I was looking for ANY additional information I could find.
Regarding your thought that the Ann Walker (b abt 1750, dtr of James Walker) who married your ancestor Charles Kimbrel might be connected to MY Walker line, I have no evidence. However I can't prove it's not true.
(I have not traced my Walker line any farther back than one Robert Walker Esquire who served as a county commissioner in Surry County, NC, in the 1700's. Robert's name appeared in many Rowan and Surry County court records from 1768 to 1786. He died in 1786. I suspect that Robert emigrated from Scotland or Ireland in the 1700's, but can't really prove it. Think he was born about 1717-1720. He had a son Robert Jr. born in America in 1748, and Robert Jr. in turn was the father of the William Walker mentioned in my previous note.)
(Each of the above Robert Walker's (Senior and Junior) had a son named James – they also reused the names Robert, William and John in each generation. While these are all VERY common names, perhaps there is a vague hint of a family naming convention that might suggest a connection to your "James" Walker? But that's really a stretch!)