Exactly. He had full access to the money. As trustee, he was responsible for distributions to the beneficiaries, and he himself was the primary beneficiary. And the terms of the trust were extremely broad.
The estate attorney was blowing smoke about it being overseen by the court. Theoretically, when the girls come of age, if the money was gone or misused, they could sue Mark for breach of fiduciary duty. It won't fly, though, because Mark is himself a beneficiary and the terms for distribution were very broad. Plus, even if they had a case and won, the money would still be gone.