This one is a New York Times article reprinted from the Van Buren Press. It has some names not in the previous mentioned lists.
http://www.nytimes.com/1861/07/22/news/gen-ben-mcculloch-and-staff.html

Another NY Times article mentioning his staff:
http://www.nytimes.com/1861/12/07/news/affairs-missouri-arrival-springfield-ben-mcculloch-misunderstanding-between-his.html

The following I'm positive you seen but just in case you haven't...it's from his Wilson's Creek report
To my personal staff I am much indebted for the coolness and rapidity with which they carried orders about the field, and would call your attention to my volunteer aides, Captain Bradfute, Messrs. Armstrong, Ben. Johnson (who had his horse killed under him), Hamilton Pike, and Major King. To Major Montgomery, quartermaster, I am also indebted for much service. He cheerfully volunteered his services as an aide during the battle, and was of much use to me. To Colonel Mcintosh, at one time at the head of his regiment and at other times in his capacity of adjutant-general, I cannot bestow too much praise.