McClure's post - through both its style and its content, left an opening for Conway to come out with this email. Dave is stuck now, and his only response from here is to come clean in some way and clear the air.
McClure has made all sorts of mistakes, first the blog post, and then the accidental tweet. He is not handling this very well and I feel for him because he is the only person from the dinner who is speaking out. The other people in attendance are suspiciously quiet (and giving away that they were there by being quiet) and leaving it to Dave to do the talking (and not doing a very good job for himself or for the rest of them).