My guess is Epstein was put into this prison to get a taste of the misery that awaits him if he did not cooperate with the investigation, while keeping him safe enough until he realized his only way of staying alive was to name names.
Obviously, Barr miscalculated in thinking Epstein wasn’t in danger in this ‘high security’ prison. The arm of the swamp is long and can reach anywhere.
While this is a setback, many of the other ‘persons of interest’ can clearly see they have much to be fearful about and their only salvation is to turn ‘state’s evidence’.
I’ll bet Barr wasn’t involved that way.