Now im not sure how Anon sign ups will work with the AI or if your only going to make it possible for player battles but i have to suggest please come down hard and fast on people who ruin the AI battles by signing up for their clan battles on the AI side (hard to do if anon or on alts i know).
Why? because it makes a mockery of the whole idea of AI battles. It may take some investigation and work
but unless these people get handed out week+ long strategus bans then it will fast turn to who can abuse it the most.