@Archdeacon Monseigneur: I've just had a manual battle against the orcs with an army containing a greatsword captain on a horse.
I've got to say, I just started laughing out loud because of how awesome he was in battle! It's perfect, the animations are splendid, no t-posing, no akward movement, no clipping. It's like he should've been a captain with greatsword all along!
I do have to admit it's the only mount I've tested him on.

what happens if you put him on a horse or gryphon?