I doubt there is a good sample of DNA and I think Tobe in one interview said that he wasn't sure if the DNA is from the killer. There isn't always DNA. The real life isn't like CSI. Paul Holes said this case wouldn't be solved through DNA. There is a possibility the DNA is from the killer and the techonology evolve in some years. Even if they have DNA or other things, the prosecution wouldn't tell that until the trial. The prosecution says the least possible in their filings and are waiting for the trial. The circus and conspiracy in the case is so big that if they said that have something, people will claim is planted and the media will made a big scene. They are waiting for the trial where the case should be tried - in the courtroom, not in the media. The attitude of the prosecution shows they are eager for the trial and hearings.
Ps- Curiously, Paul Holes was in Delphi 1 or 2 months before the RA's arrest and made a post with someone behind the prison bars and saying "the future of someone very soon" and I think after RA's arrest he made a post saying "I'm good guessing the future". Something like that, I'm not sure the exact words. I have never give much importance because it can be a coincidence but now talking about Paul Holes, I remember that. But probably it's just a coincidence.
Ps- Curiously, Paul Holes was in Delphi 1 or 2 months before the RA's arrest and made a post with someone behind the prison bars and saying "the future of someone very soon" and I think after RA's arrest he made a post saying "I'm good guessing the future". Something like that, I'm not sure the exact words. I have never give much importance because it can be a coincidence but now talking about Paul Holes, I remember that. But probably it's just a coincidence.