I'm 95% sure that Callahan told the mods to hold off on their normal enforcement of no On3 talk in order to basically allow the news to get out to everyone on the board for a few hours. Any stragglers will either hear by word of mouth or the occasional reference to it on Rivals RSS until the switch happens. By nuking the thread within a few hours, though, he makes it difficult for Rivals to claim he was poaching should there be contractual provisions against such behavior. Pretty sharp, and it's exactly what I would have done in his shoes.