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Taking the information she does have to them allows her to get a fresh, objective, third party perspective on the handling of the two cases. Her experts don't have an axe to grind, nor do they fear any negative repercussions from those parties connected to the cases. Based on experts she's consulted on previous cases, they're likely to be highly skilled in murder investigations, perhaps even moreso than anyone she could have spoken with in Coronado.
It's my experience that every time a qualified expert immerses themselves in the evidence of a case, they will see something new and help validate what is known or theorized. When they see something new or in a different light, then it's possible it leads to a new avenue for investigation. I think in this case, whether Rule found something astounding or not, a smoking gun or not, it has grabbed her attention and I'll bet she sticks with it long after the book is available. Additionally, I bet she has some great resources and connections in the forensic world.