I also was not aware of a clone site, but who knows if it even existed? Could just be another confabulation. You bring up a great point on this... the hot wallet was constantly being refilled, how could he not notice these withdrawals. In addition, the bankrolls stated Betking was in the BLACK.
Even if there was a secret "clone site", it shows how hilariously dishonest Dean is. He's basically saying he risked peoples money to run a secret site, that he didn't want to cut them in on.
This is no different than DMF of dice.ninja who used investor/players money to gamble on other casinos (until eventually he epically busted on PrimeDice and lost it all). Then just went totally dark. And offered a few signed messages promising people who was going to make repayments (which he never did, of course).
Amazingly even though his identity was known, because of lack of any prosecution he managed to get away with embezzling millions of dollars. I guess Dean is hoping he can get away with the same fate.