I'm frustrated about the commanders as well. Some exist and some do not. Some are mentioned when new troops come in and never appear. Sometimes the text says a division and sometimes 3 brigades. I guess if i had an actual order of battle i could interpret the info but i think for a game i need a little more info to allow us folks with little ACW background to understand it all.
Like "here comes Early's division , part of IV corp, consisting of 4 brigades commanded by armistad, X, Y and Z"