Your animations negative... there ARE multiple execution animations per enemy, you can stomp on heads, you can cleave them in half horizontally or vertically, you can rip them in half with your hands, so yeah... I don't get this one.
I'm referring to the R3 mechanic when a monster is stunned. Each monster has only one execution animation. I played the game so long so I probably crushed a draugr's head a thousand times with my boot. Would it have killed the dev to add another animation per monster? It's not a lot.