I would bet they got a LOT more dirt on him (Roberts). I think, if this all pans out, he would prefer to go quietly.
I would.

Would make sense.
If such a conversation was somehow intercepted, it follows that either Roberts or Breyer (or both) have been under surveillance. This would be a rather unique situation of a SCOTUS Justice being monitered, especially given that John Roberts and the SCOTUS oversee the FISA courts and would have to approve.
That alone makes it unlikely, but if true - that's pretty ominous Unless a cell phone comm was intercepted
Let's see what happens.
If it did happen and Roberts and Breyer thought they were secure - well, they just got a heck of a wake up call.