Yep, it's making all sort of sense. I almost have this whole Blackfoot Rangers nut cracked. Tying Majors to Poindexter was what I suspected would develop. While students of Missouri Civil War history should be somewhat familiar with Poindexter due to his activities in the summer of '62, his prior history has been all but lost to history.
As it turns out Poindexter made his mark early on in the MSG as first lieutenant, advanced to colonel, lost a "very close" election to become brigadier general of the 3rd Division, and ultimately went back to north Missouri to recruit in the summer of 1862. Took Harvey McKinney (the focus of my research in all this) with him. Jo Porter was Poindexter's counterpart in northeast Missouri. Poindexter was just as active as Porter, and engaged in a number of skirmishes and fights just like Porter. But Porter got all the glory because Joseph Mudd wrote a book on him.
Poindexter ultimately met a rougher 1862 fate than Porter (but not for long since Porter was KIA in '63). While Porter made his way south of the Missouri River, and on into the Confederate Army, both Poindexter and McKinney were captured. Poindexter was released on bond, suffered ill-health, lived out the war as a civilian and died not long after the war. McKinney, on the other hand, was exchanged, joined the regular Confederate army, and was KIA in 1863. McKinney's own claim to fame in all that was making it into Mudd's book on Porter in regard to the Blackfoot Rangers.
Interestingly, Mudd got the Blackfoot Rangers angle tangled up (he admits in part of the book he was confused about them). THE real/original Blackfoot Rangers were actually McKinney's Missouri State Guard Company of sharpshooters recruited around Perche Township/Boone County; western Rocky Ford Township/Boone County, and southeastern Bourbon Township, Boone County -- Company B, Majors' Cavalry Battalion, Missouri State Guard -- in 1861.
When McKinney went back to NOMO with Poindexter as Poindexter's lieutenant colonel, there was another company raised from the same area as the original one which Porter ended up calling the Blackfoot Rangers -- this one was led by another mysterious fellow lost to history, L.M. Frost. That version of the Blackfoot Rangers only lasted a few weeks, and appears to have been integrated in large part into the Purcell Scouts, another Boone County company.
This story is so interesting that I digress. So back to J.P. Majors and his MSG Cavalry Regiment. I have identified Majors as being James P. Majors, son of Samuel C. Major, of Fayette, Howard County, Missouri. James P. Majors was a graduate of West Point, and was an Indian figher and second lieutenant in the 2nd U.S. Cavalry in the lead-up to the Civil War.
But...Majors seems to disappear out of Missouri early on in the war, and reappears after the war. So...looking for info on James P. Majors.