If the engineers are in on it, their professional career is dead, so the scam would need to support them for the rest of their life.
Can you name three BFL engineers?
Let me guess, you're thinking "if a random forum poster can't name three engineers, their careers are 100% safe if they're all involved in a scam and they know this".
He's probably thinking that if BFL are running a scam then they don't need to hire engineers with reputations that aren't worth losing for a big scam, or even any engineers at all.
If you could name three BFL engineers with reputations so solid that they would have a financial disincentive to take a share in a big scam rather than continue lucrative careers then it would definitely give them a lot more legitimacy.
The only employees I am aware of are the convicted fraudster CEO and Josh, who is so extremely unprofessional it is beyond belief.
Three people on LinkedIn have Butterfly Labs on their profiles. None of them are engineers.