So based on Awakening it seems Dread Fighter would use swords, tomes, and possibly axes, while Dark Falcon probably uses the Hoshido lances, tomes, and possibly staffs?
Which wouldn't actually cover the missing weapon types as well as in Awakening; all it would add is sword/tome. So maybe there's something else to the picture? Notable missing weapon combinations so far are sword/staff, sword/tome, axe/staff, and axe/bow. Plus bow/tome, which was missing even in Awakening, and most combinations with hidden weapons.