Instead, this sudden announcement with no particular reason given, leaves a very bad taste in my mouth. What I've seen appearing in the forums during the last few days, some of the people posting in this topic and the type of messages, something is just not right with all of this. I've learned from my own work that if something is not mentioned, there's often a good reason for the omission.
I think that you see this site as some kind of very special social site or something like that, hence why you expect a clear explanation as to why someone would desocialize from the participants of the game on this site. But this site isn't mainly for social communication like FB or twitter. And even though I haven't been active on this site for pretty long, I do remember that Dan wasn't really that active on the forums. He didn't seem that social to me, or it's just that he didn't show his socialness, because he didn't see this site that way, which is probably how most players on this site see this site. But I do understand why you feel a bitter taste. You expected more from someone who interacted so much with the site itself, by contributing and playing intensively etc.
For some, your analysis may seem as an overreach, but to others, it can seem legitimate, depending on whether they knew Dan closely.