Unrepentance -not guilt- is the ground for df.
As with many things JW, there are practices which are claimed, which can be very different from the actual practice implemented.
I've read numerous reports of JWs who were DFd to make an example of them, regardless how much the person claimed repentance.
Was it a practice for a JW to be DF'ed for eating a meal with a DA'd employer prior to that happening to Ray Franz, or was that a new practice developed as a means to eliminate Ray?
I seem to recall Cynthia Franz was also present at the same meal. Was she threatened with DF'ing? I understand she was not DF'd.