A couple of other things I'll say about the last two episodes:
- The poses Avon does in Warlord. Such as when he says "I know what it makes us!" on Betafarl or "Find it Slave!" when returning on Scorpio. It's like he's become a card board cut out of himself....
I'd always seen it as Avon moving oddly because he had completely lost his mind by that point.
Or it could just be Paul hamming it up.