That is a plasuable theory. I also wonder if it is connected to the possibility that Coleman left the 46th, leaving Crabtree in command, and formed yet another command just as the raid was begining.
Bryan Howerton has a copy of a page from the Military Board Minutes that list the 40 series regiments and. I have alway believed that page has a 48th Arkansas listed, but maybe Bryan can weigh in and clarify that.