The probability is also they are all deadlocked.
This magic key is wholly dependent upon tracing the owner of a phone in 2007. That's it.
In 2007 buying a burner / throwaway was like buying a Mars Bar - no registration required. If it's a burner then it's gone; it's in the wind.
So then they turn their attention to whomever CB was allegedly talking to somewhere in the environs of Luz on 04.05.07 for 30 minutes. Well this mystery caller has not presented themselves, so they're either living like a Pythonesque hermit in a hole, dead, don't want anything to do with it, deceased, oblivious or dead.
It's been 6-8 weeks - nada. They've dug more holes than the Aussie Gold Hunters - nichts.
The lawyer of CB was not exactly sitting on the fence, his man ain't talking, why? Because his testimony is their last bastion.
Is he guilty? Who knows. But he will keep his mouth shut (cue the inevitable Leonor / torture trope) and we will move on. He may or may not be given a new 7 year sentence and maybe 3 years for 'possession' of child porn (which is unlikely to stick), then he and his new lawyer will be extremely wealthy men when they sue every media outlet on the planet, which is not a desirable outcome for a beast / rapist to attain. It's gross incompetence.