Brian's patents paid $25k for the lawyer who never had to go to court to defend Brian...$25k for a lawyer to do nothing but make statements to the media? I don't buy it. $25k can buy a new identity, and things like dental records can be bought/faked. And who knows how much more they paid the lawyer after that initial $25k. Now, I know that multiple agencies were involved and it'd be tough to pull off a fake death, but everyone has their price. And the FBI surely wouldn't want to admit that he got away while they supposedly knew where he was and had the house under surveillance.
/conspiracy
If I received a call from parents with a son in Brian's position, I'm charging at least $25k up front so that number doesn't seem odd or unreasonable to me at all. In my state, should Brian/hypothetical client have killed himself, then my ethical obligation would be to perform a "fee look back" to determine whether the $25k could be justified. If not, I'll usually work with the client to ensure my time is fairly compensated and anything unearned is returned. This wouldn't be something that would go public as it is just between the lawyer and the client and his payors. In short, nothing about hiring the lawyer and what we heard about in the documentary raised any sort of red flag or oddities.
Also, criminal defense attorneys don't buy new identities, generate fake dental records, or buy off FBI agents. That's silly movie-type stuff.