Technically, couldn't comitatenses simply follow their comes? Or the magister militum? If so, the last roman one in Gaul - self-proclamed - was Syagrius.
Quote:From first principles you cannot have comitatenses, a term which derives from "comites" meaning "companions," without a Roman emperor for the soldiers to be companions of. Therfore, after Romulus Augustulus and Julius Nepos, there were no comitatenses as such in the West.
It's simply a military term. Like 'dragoons', or 'hussars' etc. It refers to the origin, but it should not be taken literally after some time.