But that’s kinda the point and I don’t have a cogent argument for you but the FBI uses a process called parallel construction where they develope two lines of evidence one that was obtained legally but in reality is cherry picked or augmented some sort of evidence gained Via illegal surveillance or other shenanigans , the parallel track, that FBI hides from the discovery process. Any case they had fisa warrants most likely has this augmented parallel track. Apologies for the ad hoc nomenclature to describe poorly their scam
No need to apologize. You explained it well!