I just fought a battle and he has the correct battle model:
Spoiler Alert, click show to read:
As I said before, I haven't messed with anything relating to Lu Bu's battle model (maybe ever), so I'm unsure why you wouldn't have it on your. Are you sure it wasn't either a captain with the name Lu Bu or an adopted character that had the same name (would have different portrait). It couldn't be a download or installation error, as ever an incorrect letter or number in bmdb would cause the mod to fail to start.