You said: "The dna in this case raises reasonable doubt."
That is correct.
I said: "We know the DNA is not from any Ramsey family member. It's certainly reasonable to believe the killer lowered JonBenet's leggings. Since that is reasonable, by excluding the Ramseys you have proof beyond a reasonable doubt. That makes it exonerating evidence."
That is also correct.
Please note that both you and I adhere to "proof beyond a reasonable doubt" as the standard that makes DNA, by itself, exonerating evidence.
HTH
In a trial yes. In an investigation, no. There is no "reasonable doubt" criteria for crossing someone off the suspect list.