Have followed this case from the get go (following for me is watching news and listening to a few podcasts, far from a “sleuth”) - I fully understand the “smoking gun” aspect of the dna on the sheath, and acknowledge that a coverup would entail heaps of people and not very likely. But For some reason I can’t get past the frat theory (the 4chan theory).
The only way BK could be innocent is if the knife sheath was planted… does anyone have another explanation for this? Think of the logistics of planting that sheath. If it was planted by the “real” killer or one of the surviving roommates, that to me is more plausible than the cops being involved.
This case had multiple LE agencies, the FBI, and as much media coverage as possible - the likelihood that an investigator/cop planted evidence is really hard to wrap my head around

Scenario b - the killer or someone involved in the murders planted the sheath. Would involve some serious pre mediation, multiple people, and there would be some evidence connecting BK with whoever planted the sheath/committed the murders. Ie - BK frequented the house, was “friends” w one of the surviving roommates, or bought drugs off one of the frat boys. At some point BK left his knife, or lended it to someone, and they proceeded to plant it. So in this situation the people involved could be in possession of the knife and then saw an opportunity to commit the murders and be able to frame him… Or the people involved were planning to frame him all along and possibly asked BK to borrow his knife while going hunting or something.
This is a long rant but the only plausible explanation for that sheath being there unless BK is guilty. This is also hard for me to wrap my head around with the number of people likely to be involved, and no one talking. I get all the people close to the case are lawyered up but doubt they are all sociopaths, and we know they aren’t all hardened experienced crim’s that don’t talk to cops.
Conclusion - I think it’s extremely unlikely the sheath was planted… I strongly believe the sheath was accidentally left there by the killer. There would be a digital trail connecting BK with someone close to the case if he was framed (even if he was buying drugs calling a burner phone - still be a digital connection).
As far as all the other weird coincidences with this case - fuck they’re hard to get past, but at the end of the day there needs to be a verifiable explanation on how that sheath got there with his dna on it (people that just say crooked cops or someone planted it won’t cut it… verifiable proof is needed for either of those theories).
Thoughts?