No worries, like i said, theres others if you wanna dig around. The fan made timelines are amazing, if I find them again I'll definatley post them.
And heres just another good story recap I found that seems pretty accurate to me based on everything I'm reading.
-Errol (Childress) is the child of Billy Childress. The person in the shed is Billy Childress, who abused Errol viciously and Errol is now torturing his Dad for the childhood abuse he endured. For more proof, refer to a quick glance at the Tuttle family tree. Sam Tuttle had Elizabeth Childress as a mistress, who gave birth to Billy. This point is under construction and I haven't fully hashed it out.
-Errol is a serial killer and worked with DeWall and Reggie to do the public ritual killings. Errol leads this effort because of the abuse he himself endured from Sam Tuttle and other family members, both physical and sexual (Something along the lines of "What they did to me, I will do to all the children of man"). Reggie and DeWall also endured similar abuse and were thus willing assistants ie also priests, acolytes. Notice that Reggie and Errol have identical spiral tattoos made with an incision.
-The dozens of missing children with "made in error" tags in their files were killed for cult rituals and/or sexual abuse by Sam Tuttle/the family as a whole. These were not public killings and are buried in the yard. Remember also that Sam Tuttle "liked them that one time, and never again." Meaning he preferred to rape them when they were young and virgins.
-The Tuttle family is an abomination sick combination of incest, sexual/physical abuse, and extremist/fundamentalist backwoods regional-culture-based cult worship. These three parts are necessary and separate elements (incest, abuse, and cult worship) that come together to form the story of the Tuttles. Refer to Errol's half sister detailing her (probably first) rape by Sam Tuttle for more details. Carcosa was built by the Tuttle family, not by Errol.
-It is difficult if not impossible to know who the 5 members of the video were, beyond that they were all definitely a part of the extended Tuttle family. It is wholly possible that Errol, Reggie, and DeWitt were not even a part of this group. It is almost assured that Billy Lee Tuttle was one of the members, given his possession of the tape. In addition, he was a pure-breed Tuttle. Someone should make a list of possible suspects (should not include Maggie's father)
-The cover up is ongoing, likely driven by Edwin Tuttle. My best guess is that he is also one of "the 5." Refer to the FBI discrediting stories that Errol was related to the family. (we know for a fact he is)
That's all I can think of right now. As an aside, some are a bit too concerned with the meta of the story. It's easy to draw relations to any set of mythos you wish, its the nature of myth. Homage and allusion should not be confused for meaning. Overall, overanalyzing ends up overcrediting Nick P's story here - the storytelling and directing is detailed, but not to the point that some of you are analyzing. And that's okay. And yes, I think Rust's 'transformation' at the end is quite a weak plot point and development, but that's a different discussion altogether and just my opinion.