total war heroes are on their own though, they don't have a cohort. It's just the 1 chief. He might not be weak by any stretch, but I doubt any single skink is really going to do much against 80 guys in plate armor on his own unlike the other heroes. A skar-veteran Oldblood or sunblood is for that
Anyway, I'd imagine skinks prieststo be our wizard heroes, and chieftans be our assasiny/duellist-type hero, and I'd expect them to not have stegadons. It wouldn't fit with how the other heroes work in the total war game. I'd sooner expect us to have slann and oldbloods as general options, and then as a mount the oldblood can get a carnosaur, hile the slanns get a stegadon. Mazdamundi just gets a named stegadon. Much like how karl franz's rides deathclaw while a normal general just rides a random griffon.