Good to hear from you again. I'd like to know more about your current projects, like this one. Confederate artillery would likely have been manned by members of Ferrell's Georgia Battery. Other elements of Roddey's command would have included Hannon's 53rd Alabama Regiment. I'm not sure where Julian's and Moreland's Battalions would have been in late May -- possibly south of the Tennessee River along the Bear Creek line.
The O.R. includes the following note regarding Patterson's Cavalry regiment --
HDQRS. 3rd DIVISION, XIV ARMY CORPS, May 25, 1863--10 p.m.
Lieut. Col. GEORGE E. FLYNT,
A. A. G. and Chief of Staff, Fourteenth Army Corps:
Cox's regiment of cavalry from Rover have arrived at Chapel Hill, in place of Patterson's. Forrest was expected at Riggs' cross-roads to-day or to-morrow.
This reference from vol. XXIII/2, p. 362, suggests that the 5th Alabama Cavalry remained until relieved by the 1st Confederate Cavalry. Certainly it would not have been good practice to vacate this sector until another unit took over this line of pickets.
For other sources, see Pickens, Patton Keith, "A History of the Fifth Alabama Cavalry Regiment CSA," Journal of Muscle Shoals History, 15 (1999), 93-125, and Sheridan, Richard C., "Civil War Manufacturing in the Tennessee Valley, Ibid., 50-68.
You may also find Bill McDonald's many published accounts of the war in northwest Alabama useful. Several touch on or overlap events of Cornyn's Raid.