If you have just your captain left, it would be nice if you could change your unit type. Maybe the captain could suffer some point deductions, as he isn't familiar with the new style of fighting, but still has good leadership skills. I feel like the game makes it easier for only your captain to stay alive, which is nice(not sure if true), but unless you want to sacrifce a potentially great captain you got to ditch him to get a new type of unit. Is there an option to drop miltia/disband unit, but keep your captain?