Whether or not CR's confession is legitimized under due process, the facts remain:
(1) A car he had known use of (through his employer) is on videotape at the time just before she went missing following Mollie and driving back and forth as she was running on that isolated road surrounded by cornfields (IMO seeing if the coast was clear to confront her 'unseen', but he was 'seen' on the video camera installed at one of the homes along the road he did not know of, and there's her fitbit data that could have shown an increase in stress/heartbeat within the same timeframe the video was taken that indicated she was under severe/abnormal distress all of a sudden for a young athlete on a routine run),
(2) There must be physical evidence of her being in the trunk of the car he was driving (during his interview with LE he said he had 'blocked out his memory" of what happened after he approached her and she threatened to call 911 on her cell phone if he didn't leave her alone, but when he "came to" in the drivers' seat of the car he saw her earbuds in his lap and then realized he had put her in the trunk of his car, so presumably the trunk of that car was combed for forensic evidence of her presence, and some evidence was found and documented)
(3) He led LE straight to Mollie's body hidden in a nearby cornfield after they interviewed him and read him his rights over that "12 hour period" or whatever, which no one could have done if they did not have any knowledge of or were not involved in her abduction and/or murder.
These facts should stand alone outside of any questions about when during his interview with LE after they had the videotape and pulled him in for questioning he was read his rights or advised about counsel being present, and/or what he agreed to talk about with LE during the hours he was interviewed, even with potential language barriers, timing of miranda-izing, etc. Besides, it could have well taken the 9 or 10 hours (his defense team is claiming he was interviewed by LE before being read his rights) for them to have gotten anything substantive out of him in terms of his culpability, and then they were like, okay, now that you said "that", we need to read you your rights...
IMOO it seems the DA has plenty of factual and forensic evidence against CR to convict him, and he has a snowball's chance in 'h-e-double toothpicks' of getting off for murdering Mollie based on the facts, and these are only a few mentioned above -- there're also the results of the forensic evidence collected at the location her body was found, and the autopsy, either or both of which may also place CR at the scene of the crime(s). In addition, the 6 to 8 days predicted by the Assistant DA for the trial, which seems quite minimal, also indicates IMOO that the prosecutors are confident in the factual and forensic evidence they have to convict CR of viciously stalking and abducting and murdering Mollie, an innocent young woman who was going about her normal routine in her own hometown. Mollie, may you rest in peace, and your family and loved ones find peace in remembering your life and incredible gifts you gave to everyone. You will never be forgotten!!