Just like most other large scale scams, there are almost certainly multiple persons behind the MyBitcoin scam. It was so well prepared ahead of time (1+ year of effort), so well organized, etc.
For example the Bitcoin Police did a pretty good job of linking MyBitcoin to Dalin Owen: http://bitcoin.crimeunit.net/wiki/index.php/MyBitcoin_Summary
- Dalin clearly has the technical skills to develop the technology running a site like MyBitcoin, especially given the technical security measures that were deployed behind it, his background in online security & anonymity, his confessed association with Privacy Sharks, etc.
- Bruce would have the entrepreneurial mind and creativity to invent MyBitcoin, plan the operation, manage it, promote it via his show, etc, especially given his confession of running Bold Funding Inc and public court records demonstrating he defrauded his customers.
Therefore one could imagine Dalin and Bruce (and perhaps others) being the guys running MyBitcoin, with Tod/Tom Williams being an alias used by either Dalin or Bruce over multiple years in different situations (the brain is a poor source of entropy, people inventing fake names re-use the same ones, etc).
(There is so much drama and so many stories happening in the Bitcoin community, wow.)