To the untrained eye, this testimony of Chris' may seem to solve everything, but it does not. I am not referring to motive here, <modsnip>I'm talking about evidence. This covers some evidence problems, mainly with order of placement in the mine. It explains why the fuel elements were below the body in the shaft. And why the sprite bottle was there. Here's a preliminary list of things that do not fit this new story:
The tire treads don't match. If he picked her up in his Jeep and drove her straight to the mine, why don't the treads match?
Chris changed the tires.
The car and the driver don't match If it was the Jeep, why did MB see a bright red compact car with a tiny blonde haired guy pick a girl up?
Because MB actually saw a guy pick up a girl.
The dates don't match. If it all happened at once like that on the 28th, why was Chris so concerned about his alibi for the 29th of June?
Because it points away from the day he killed Erin.
The absence of conspirators doesn't match Why did Nichole say she managed to keep her "story" straight, and they "didn't get anything"?
Nichole most likely put 2 and 2 together, after Erin disappeared that day.
Nichole's knowledge doesn't fit. If Chris never told Nichole, how would she know to implicate him in the disappearance?
Answered above.
Cell phone records do not support it. Erin's phone cut out 20 minutes before Chris' did. Why would Erin's phone shut off so quickly?
Chris had service through verizon, Erin had AT&T. Verizon has better tower infrastructure, this better reception.
Crime scene evidence does not fit with it. Erin had been strangled so severely that her blood got on the handles of the garrote. If this had happened anywhere near to the time her body was dropped, there would have been blood all over the walls of the mine. There was none. (The heart can keep beating for as many as 5 minutes after brain death)
The DNA expert said all of the DNA could have been transferred as her body decomposed.
Lack of clean up efforts are not believable. Chris wanted to hide what he'd done, so why didn't he go back with explosives, or thermite, as marines are trained to do, and blast to cover everything up? He could have gotten the tank back too. He had a whole day to do something before she was even reported missing. What happened?
Where would he get explosives? Go back to the scene of the crime and draw attention to the mine? Not even Chris is that dumb.
This is just a cursory review. I'm sure there are many other problems with it.