I see that I failed to answer your question about where I obtained the information about White's identity. Yes, you are correct that some of that I obtained from the "Official Records of the War of the Rebellion," series 2, vol. 8, pp. 124-5. I see in the endnote #118 that I also consulted the 1860 Johnson County census and the rolls of the 7th Cavalry MSM that the man White shot while plowing may have been the trooper in the 7th. In my more recent writings I try to write the endnotes so that they are easier to use.
Bruce