My feeling is that they are both covering up. MC seems genuinely scared - of making the wrong statement to media. She seems so beaten down by him. I listened many times to the 911 call. She is so unsure of herself and frightened - of HIM. He is overly dramatic with his ranting, etc. A Dad would be out looking for her with flashlight, car, phone and pounding on doors. He is far too focused on threats to kill somebody. It's as if he already knows what happened to her. Waay too much drama and indignation. In a case like this, there is drama enough without trying to create more.
He is trying too hard to make his case. Something bad happened to Haleigh and Misty is the poor schlepp who got stuck being the "cover" person. Any real parent would have called 911 THEMSELVES and not leave it to a stumbling bumbling teenager to try and explain the situation clearly. The whole 911 call was about as clear as mud. The dispatcher had to ask to speak to him. Good grief, I would have snatched the phone away from MC immediately. He knows enough to realize that was just the dispatcher on the other end, not the officers on the way out there.
The whole washing the blankets story doesn't fit into an abduction scenario. That's why there is so much speculation on this board about it - it doesn't fit. When she is interviewed, she seems so resigned and very tired of keeping her story straight. Watch his facial expressions when she speaks. He tries to direct her in her statements. He has to contain his anger in front of the cameras. He seems like an abuser to me. In many ways. I don't think his children escaped his wrath.