That's still circumstantial, in my opinion.  Just because both wallets sent funds to two common addresses isn't proof that they are owned by the same person.  Two different casinos could be using a common service provider, ISP, coder, etc., etc.

I agree that there are a lot of coincidences; profanity in the usernames, similar coding style for the two sites, similar business models, similar administration... but again, non of that is irrefutable evidence.