He and I were pretty good friends, and he's never said anything to me regarding why he suddenly disappeared. In fact, he hasn't spoken to me at all since his disappearance.
As for the Taiganet issues...those are Bill's fault and Bill's alone. He decided to be an absentee administrator, and that simply will not work. He allowed us to be kept in the dark about the progress of the program, and he allowed the forum to basically crumble into a massive heap of shit. If Dan left there for that reason, I don't blame him. But he should NOT have left the rest of us too.