The reason why you're behind him/her is because of how much gold you have in allies. Like del said, BFA, and BFE are the main factors of why you are behind him/her.
You are partially correct, BFA and BFE is counted into your CR, but so is your battles won/lost too, I think the CR works like the overall lb
Is there a way to get a clan back when you forgot the email and password used to create the account holding the clan.
If you are on the account that created the clan, maybe...you would need to prove you were the player that created the clan. If you have no access to the account, email or password, I would say you are out of luck. support@athinkingape.com Contact them and find out.