That DNA you describe is not what they have. YOu are assuming that the DNA evidence they used to locate him is admissible onto evidence.It is speculative.
It likely cannot be because he has not consented to give a sample to his DNA material for comparison. They need court order to take it. So far none of that has happened.
We also do not know if the accused has an alibi or not.
NO murder weapon has been located either.
Like I said, most of the evidence against him is circumstantial at this point. That might change after extradition to IDAHO. BUt I do not think that the accused is required to give any evidence against himself, including a DNA match sample.
Since he had no previous criminal record ( at least haven’t heard of one) they could have matched up the DNA via all those DNA heredity programs out there.
I believe the SC ruled that any discarded cup, straw, chewing gum, etc can be scrounged and tested to see if the dna found at the crime scene matches the suspect’s discarded stuff. Once he discards it, it is fair game, no court order needed.
His vehicle would likely be a trove of his DNA, plus his living quarters.
They already have court orders. They now have his DNA from his apartment, his car, toothbrush, combs, clothes, etc. etc.all now processed as evidence blessed by court order. If this DIRECT DNA matches anything at the crime scene he is done. No alibi will save him.