I think the answer to the question posed in the lengthy SI article is 'No'. The worst case scenario for the prosecution is they want to use the 'rogue' agent(s) testimony and the truthfulness of the witness can be challenged. There is, however, a great deal of other evidence available to convict the defendants, video and audio recordings, bank records, tax returns not properly disclosing income received through bribes, etc. These cases do not hinge on the testimony of one witness, prosecutors like to obtain convictions, they are ethically obligated to seek justice, the multiple search warrants obtained in the investigative stage were properly obtained, there is a high likelihood most of the defendants will plead out, this isn't Law & Order, risk of conviction at trial and a resulting longer sentence is very high, I will be surprised if any of these go to trial.