OK here is my theory. I call it the 5+3 theory.
It seemed that all 4 locations had security dogs roaming around, some of them vicious. Also, at some of the locations, if not all, there were no signs of forced entry. If one person or one
group of people killed all 8 people, they probably visited those 4 places on a regular basis. This makes the group of possible suspects very small. I would say, it basically would only
include family members. With the illegal pot growing operations, I would think that not many people would be invited to come over. So the people involved all are related to the victims (cousin's, married into the family). Let me call this the "extended Rhoden family". So my theory is that there is a feud within the extended Rhoden family. There may be 2 sides but it is not
exactly clear who is on which side. There are two accounts for funeral arrangements on some funding website. One account is for Dana and her children and grandchildren.
The other one is for the "original Rhoden's", Gary, Kenneth and Chris Sr. So perhaps the fault line runs between these two groups. Among the victims,
Dana, Chris Jr., Frankie, and the two Hanna's are on one side, and Gary Kenneth and Chris Sr. are on the other. The second group has ties to Kentucky.
There may have been a major disagreement about money between the two camps. It may have been related to the pot growing and other illegal activities. There may have
been violent confrontations and threats before the night of the murders. Manley does at one point mention that there was tension since the beginning of the year in some interview, IIRC.
This all exploded on the night of the murder. I speculate that Frankie and Chris Jr. were the targets of an initial planned attack. They have been confrontational in the past, also with family members.
The women may have been killed because they were witnesses. Later that night, some people in the Peebles clan found out about the murders and concluded that Chris Sr., Gary and Kenneth were involved and retaliated.
Of course this is just a theory. It is not clear exactly how the fault line lies (if there is any). It could also be a 6+2 theory or 7+1 theory. But the main thesis is that not all murders were committed by the same person/group. But that there was a number of homicides, causing a retaliation with more homicides.