He probably didnt think it was important to let everyone know that he left Rare to join NightWatch so i'll try to clear things up for you.
We got into a little bit heated discussion (no insults) when he was joining NightWatch on Primetime when we needed him on Albion. It's basically the same thing that happened with Muni and Moe and if you want to know my reasoning for really hating this behaviour read the thread "Values of a Community". Fact is though i didn't kick him like i did Moe and Chris, he left in a Rage really unexpected and joined NightWatch a day after.
Some personal words that may differ with your opinion.
For me its pretty clear he intended to join them for a couple of time already. He's playing alot again and unlike most of us does alot PvE stuff and hangs around in their TS, which is absolutely not a problem at all but for me makes it look like he's been planning that and waited for a moment like that to take the next step. I might be wrong on that as i never had the feeling he was a calculating type of guy. But even if he did leave in a haste the fact that he joined NW a day after, leaving friendship(s) (can only speak for myself) behind like that really disturbed me and actually made me sad as im the type of guy that cant really forgive that kind of things and always have it in the back of the head, which doesnt mean im unforgiving, i also talk normal with Moe again, still pretty much ignoring Chris tho. But i definately don't want to get any more close than necessary with people like them. Men should have some principles imo.
Anyway, its a really bad thing to see him go, he's been a big part of the guild and i liked him not for the way he played but for his nature.
My last word is, i will always stick to the principles we always had no matter the person but in this case HE decided to leave us after hurting our "codex" or logical behaviour inside of a RvR oriented guild.
It's sad not only for us but for him too once he realizes what he did and for what especially. Anyway just my 2 Cents!