(the reason Tihan keeps repeating that his role was hands off is because he'd lose safe harbour protection from liability if he took part in the day to day running of the company).
He had the critical password, apparently. So while he might be able to wash his hands of responsibility for money-laundering going through his pipelines he remains a prime suspect in the theft. He could have insisted that password be changed had he wanted to wash his hands of that.
-MarkM-