Mr. Laser Beam wrote:
It could be that the Vulcans just don't have a rank of commander.
Yes, they do.
They'd have to, wouldn't they? It makes absolutely no sense to have a rank named 'subcommander' if you don't have one called 'commander'. Not too logical, if you will.
Plus which, we know the Romulans have the ranks of subcommander and commander. It always seemed to me that the Vulcans having the subcommander rank was kind of a nice touch, drawing a nice little parallel between the two divergent branches of the same culture. You'd want to think that the similar rank structures grew out of the same military traditions of Vulcan antiquity.