The request for office training information does not bother me. It is important to verify that officers handling evidence in the chain of custody are appropriately changed. It is important to verify that the officers taking initial reports from the two survivors were appropriately trained and kept appropriate records.
Although it is hard to imagine how BK is not guilty, there are weaknesses in the prosecution case.
There is an 8 hour gap between the assumed time of the crime and the 911 call. There were two survivors/witnesses in the house in different locations (although I have seen no direct proof of that), and both delayed a very long time. Did either survivor contaminate the crime scene? Did the friends called for help contaminate the crime scene? These individuals are victims on the forum, but witnesses to the legal system.
LE has identified a car matching that of BK, but is it THE CAR? Or something similar?
We have cell evidence that BK was often near the murder house, but the information released so far does not place him at the house.
There is suspicious activity with his phone the night of the crime, but his phone cannot be placed in Moscow at that time.
If the defense can somehow exclude the DNA, this case becomes much more interesting. If the DNA stays, it is hard to see a feasible way to Reasonable Doubt.