Your point is well taken. I may be prejudice in my approach but the eastern Guerillas are well covered in many books (I have several myself) while the western ones are not, Quantril being the notable exception. Because he went east and was killed wouldn't preclude his being considered in the western board where most of his activity
took place. In addition, most of my Civil War ancesters fought with or against the AR and MO guerillas, so I guess I'll have to support my original recommendation.