I don't know Idaho law, but in some states, the defense *must* state the nature of its defense at the preliminary. No spaghetti throwing defenses in those states.
I can't remember which state it was (I think Colorado) where the defense had to specifically alert the Court that they were going with a SODDI defense, but they had to tell the Judge who, specifically, the Other Dude was. No wild claims of "hey, someone else did it!" Nope, just the claim that defendant didn't do it.
If Defense claims "defendant didn't do it," and "defendant has no verifiable alibi," then that narrows down what will be happening at the Prelim - and at Trial. If the defense provides an alibi for BK, then in some states (again, I don't know about Idaho), that has to be told to the Judge before Prelim or, at least, before trial.
In some states, defense can just say SODDI and that's okay. Or, "Some Dude with X characteristics - if there's unidentified DNA lying around - then the jury has to try the facts to see if that makes sense."
IOW, the defense cannot just show up at Prelim and say "Some Asian dude did it because we sequenced the DNA found in the glove box and it looks like a partial for an Asian Dude!"
They have to give notice to the State before they do this at Prelim. They are using evidence, perhaps, or an interpretation of the evidence, that the State does not have. If both sides agree that Some Asian Dude's DNA in the glove box exists, then that DNA is likely to come in as evidence. If the defense has no sequencing to show that such DNA exists, who knows what the Judge will do? If the defense can get things retested after the Prelim, things could change again in pre-trial motions.
Again, not a lawyer and certainly not familiar with Idaho law.
IMO.