Since all the news stories reported that detail about CR1, safe to assume the coroner made that specific notation about more advanced state of decomposition. Reporters wouldn't have enough details in those reports to reach that conclusion on their own. From that note, it's logical to assume he may have been killed first.
We'll find out.
ETA: I don't think official TOD was included in the preliminary AR. That info is in the final AR, which is probably one of the reasons the state wanted to keep that info quiet until the trials.
The actual time of death is very important in a case like this. It is usually determined by temperature of the liver and the ambient temperature. It would be very important to know if the victims were killed within minutes of each other or if there is a larger time gap. If KR and CRsr were killed at nearly the same time, there had to be shooters at both places at the same time. If CRsr and GR were not killed within minutes of each other, what was the delay? Was one not home or kept alive for some reason. Same with HR and DR. All opinions only...