Well, maybe think of this type of thread as the online version of a get together with friends ans one friend says to the others, "hey, remember old so-and-so? what's he up to these days anyhow? Haven't heard from him in a coon's age." (Ok, that's what that conversation would sound like out here in the country where I live - and I have no idea what or how long a coon's age is, so don't ask)
There's no real expectation that anyone really knows...it's just an openly expressed curiosity about said so-and-so. Generally followed by reminiscences and heartfelt well wishes for so-and-so. I think that's really all there is to it. Just a virtual front porch, and something to talk about.
You know, a while ago I went back and read threads about Shaun leaving because I had been skipping around listening to old podcasts and I got confused because he was there and then I realized he wasn't...so out of curiosity I was trying to figure out when and how that happened. It's just a natural reaction. I agree some people on the threads I found were over the top (and maybe others had been deleted?) But I don't think that's what's going on here. We are just fangirls (er, and boys) that are chatting about whether or not our Dustin and Shauny-poo are doing well. No expectations. I don't think anyone has the maps with sightings pinned and triangulation marked in red, newspaper clippings and pictures taped to their walls or anything...right people?? Um, I hope not anyway.
PS we miss you too when we don't see you often enough on the show. We can't help it! We just love ya

(and John too and so forth and so on)