Some random thoughts. Forgive me for not pulling quotes; I'm quite terrible at that. Also, these are just my thoughts about things we know.
Remember way back in the beginning of this crazy case, Lori was allegedly obsessed with Chad's books. (I read a lot, and I have Kindle. His are on the literary level of The Babysitter's Club.) She was a fangurrrl.
Ole Chad seems like he requires a lot of ego stroking. Dude thinks he's a prophet, can't get more egotistical than that.
Lori is like the Prom Queen compared to Chad. Plus she's bats&*t crazy. They're into riding off into the apocalypse. They had interacted on Podcasts that are public knowledge. Wonder what they got up to that wasn't recorded? I think they had at the very least, an emotional affair going. Likely physical, as well. I think it's possible Tammy was very alarmed by some of Chad's beliefs and perhaps things she may have found out re: Lori, so she had to go.
I really wonder if LE isn't handling this so delicately because it's just the tip of a much bigger iceberg.