Hope not. Why would they take the fall and destroy their careers and reputations (such as they are for ATF guys)? If they do someone needs to look at their bank accounts for large deposits.
The better choice? The feds set them up? The easy way out? Were promises made?
Fact is they were likely guilty of numerous things and were reckless performing their duties etc, possibly caught lying etc.
Could be they set up after the lid popped off and the agent was killed? That would have been easy.
What will be interesting to see, if any criminal charges are brought against these 5 participants.