One particularly interesting point is that Montgomery was, presumably, not given the opportunity to resign.
Don't want to speculate too deeply, but one would think that if it were a consensual issue, ala McDonalds' former CEO, he would be given the chance to resign.
It was obviously something the organization wants to have been on the record condemning, if/when it comes out.
It is likely also currently in the hands of lawyers, which would explain Bill's inability to comment.
There's probably enough crums here to get within the neighbourhood of what he's done.