This should be interesting.
There is only one "report" showing items where DNA was found and tested.
It's really just a summary, and it's only based on the "strongest sample". it gives no data about which loci were identified, or which alleles are represented.
Now the arguing begins. One set of people will believe there is DNA not related to the Rs, end of story, there was an intruder, and that's that. Oh and the DA "exonerated" the Rs on this evidence.
Others will argue that it's not so black & white. The report mentioned above has a HUGE IF qualilifier, which in and of itself is cause for another argument. The sample was mixed, again more arguing, and the report states, IF minor component is a mixture, Rs wouldn't be excluded.
The argument stems from the idea that this was a "partial (only 10 loci), mixed profile.
This offers an excellent review of how mixed samples are analyzed. Yes we know JRB was the main contributor, but we don't know with certainty whether not the other minor component was from more than one contributor. That is b/c
The "thus masked" is the problem. When this happens a 3 person sample can present as a 2 person sample, and therefore the lab should only state "at least" 2 contributors," which of course is not an absolute. Added to this is the issue of working with only 10 loci, instead of 13, which although acceptable, provides less info. This is why I believe there is the IF qualifier on the report.
Anyway that's the long and short of it from the prospective that the DNA proves nothing, but I'm sure there will be loads of counter arguments.
Very good site here about analyzing a mixed sample.
http://www.fbi.gov/about-us/lab/biometric-analysis/codis/swgdam-interpretation-guidelines
Beginning at section 3.5