I noticed several months back that they're taped pretty early on in the evening; I drove by the studios one night and the windows were DARK.

Seems like the change came not long after Durkee left. Occasionally Paul Crocket gives the impression (time checks, etc) of being live, but I don't know why some days it would be and some days not. Don Bishop has to be in at some point overnight but I don't know when and / or if he's live or Memorex... at least it is a warm body...
Marshall Stewart is still there; I hear him regularly in the mornings.
It took a while but I found this page listing their news team (it still has a nice bio of Neal Kennedy on it):
http://krmg.com/inside/tablenews.html
Last I heard, they had only moved Rush up to noon, Hannity up to 3... are you sure it was 5 that you heard Michael, or 6? If they've moved it up an hour, then Rush & Sean may be live... either that, or they cut off an hour of Hannity, which doesn't seem likely.
WOODYRR: Although I love DX-ing for the fun of it, you DO know that you can listen to them crystal-clear online at
http://krmg.com? If you weren't aware, give it a shot... where I live, I lose them at night so when storms come in I click on the "LISTEN LIVE!" link (until the power goes out...).
If KRMG ever DOES get rid of Boortz (which would be a shame; the guy's a hoot!), you can always listen straight from the source, News / Talk 750 WSB in Atlanta at
http://wsbradio.com/. They have him on
7:30am to noon our time weekdays! (I think the 1st 30 minutes of that he may be doing something similar to what Joe Kelly does here ("Here's the news / here's the weather / here's the traffic") but it still might be entertaining to hear Boortz doing "regular" radio.