Agree that IF this was a rape/murder it's unlikely two people were involved in the rape/murder (group sexual assaults happen, but are pretty rare) but I'm not convinced another party wasn't knowingly involved after the fact.
I'm not a huge fan of the BD/ST theory (although I do believe it's definitely a valid theory worth considering) because I feel the window for the murder to happen is really narrow if we involve BD. Blaine and Brendan initially stated they woke Bobby up at 345. That gives him from 4-5 to commit the rape/murder, hide the body, and get cleaned up as he was back at the house at 5. Also, who burned the body? BD is back at home at 5, and spends the next 3 hours sleeping/watching tv (per his statement) ST is in GB w. Barb from 530-730
If Steven didn't do this (and I'm not 100 percent ready to rule him out btw) then I think the best suspect would be CA. While ST/BD do have suspicious alibis that should be probed further, they are accounted for during significant portions of the night, which narrows the timeline. The timeline for CA remains wide open. Until someone can pin down his specific locations during the 245-5 time period, he's the #1 alternate suspect in my book. He knew Teresa was there, he knows the property well/can access everything on it easily, has a history of aggressive behavior w. Women customers, and had a violent, volatile relationship with his ex-wife, w. Multiple incidents of violent behavior, including violation of domestic abuse injunction, threats, stalking, preventing her from calling LE, and forcible rape.
Would like to add that assuming CA did not murder Teresa, I believe he knows something and/or aided after the fact. His house was at too central of a location to see nothing if he was in it alone all night like he said (his reason for having no alibi was he lives by himself) Brendan states repeatedly they drove the RAV4 past his house and that he "probably knew". He also sees Steven and CA together in the garage the day after the murder talking and working on a car, which LE immediately tells him Ian true because it doesn't fit their narrative. He was very involved in this from the beginning, and I just don't buy that he knows nothing. Someone on that property knows something and saw something, IMO
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Question because I can't recall: Does BD (not Brendan) have an alibi confirming he was in the trailer from 5 until whenever, sleeping/watching tv?