The only list I have is the online roster of Company C, Shanks' Regiment in the MO Secretary of State's Office, Missouri State Archives. Warren Welch does not list anyone associated with this phase of his journal as being with him riding to Jackson County from the Confederate Army or in his brief narrative of actions near Kansas City in winter of 1863-1864.
Where do you find "Welch's 1911 list"?
Neither Crump, Parr, Hays, Jacobs, nor Bob Thompson is listed in Shanks' Regiment in the Missouri State Archives site. I see a William Thompson from Lone Jack on the list of Company C members. As I indicated, this online list of Shanks' Regiment members seems to have been put together from postwar reunion and UDC records and not war records. Lots of men's names are omitted.
I'm guessing that the 30 who rode with Welch came from this regiment. There is a good chance these men came from other units.