On Abraham leaving, they've brought it up about his character that Rick has his mission, and Abraham has his, and Abraham's possible flaw (or advantage) is he's completely focused on his "mission" and I think the mission is what his leaving is all about... He says there's a threat to Eugene so he's leaving. Maggie/Glenn convince him if he sticks around 12 hours to help deal with the Hunters they'll go with him, no questions, no hassle. He wants that, so he agrees. He leaves, they leave with him. He is on his mission, and his mission doesn't include looking for Darryl/Carol, which is what Rick wants to stay and do. Abraham's leaving is about leaving Darryl/Carol and continuing the DC trip, is the way I see it. So to me it makes sense I guess.
Garreth knows Carol, Tyrese, and Judith's names via Tyrese's goon he let go. He knew Bob's name back at Terminus, Rick as well if I recall, back at the trough. It's tough to say how long they were being held because there's not a clear cut timeline on that... The group look to have worked on their weapons a little while though, so I'm ok with suspending disbelief that he learned the names of the captives quickly and got the last 3 from the guy Tyrese didn't kill.
The slaughter of the Termites in the church was OUTSTANDING. Every bit as satisfying, if not a little more quick, as the Claimers being killed. I think it is personal with Garreth, but I think it's a personal thing that goes back to the takeover of Terminus from them. I think that eating people is clearly not a necessity, so they do it for some reason beyond that. They can hunt. They can gather. The ability to maintain a society that way is clear with Woodbury, so I think the Termites maintain the "it's not personal" thing for their own psyche, but they're all doing what they do because it's personal. At the very least the core ones (Garreth, his mother, etc.).
No clue on the tainted meat thing... I'd go with whatever you say on that Bill. All I can add is that people won't eat meat from a kill if say the intestines or whatever are punctured and contaminate the meat. It's why gutting a deer is so important that it's done right. I dunno. I can go either way thinking the cooking helped reduce risk or it didn't and they were all going to die. Ingesting stuff puts it in your bloodstream, so does the bite it seems, sooooo... I dunno. Maybe they'll never get to explaining that type of stuff?
I couldn't gather whether Rick & Co. came back on purpose, and lured the Termites in on purpose, or if they just happened back for some reason? They didn't seem to explain that. I like to think Rick did that on purpose, and basically used everyone in Gabriel's office as bait, more or less.
Gabriel's big character flaw is he's a coward then? I'm underwhelmed.
I think Darryl has Morgan with him, or someone new, but not Carol. I just don't see why he'd keep her back (she's as competent as he is, and she knows the group and they know her). Morgan you'd keep back because he doesn't know everyone to see them... I dunno. I'm just betting it's not Carol.
That's all I can gather.
Wherever Beth is, it sure looks populated.