First, my recollection of the Nancy Grace reporter as saying, they "THOUGHT" Misty used the other bathroom, IS THIS PROVEN?
-If she did use the other bathroom, it "could" be as the other poster mentioned that she did not want to wake the childeren up with the camode flusing.
OR
-Misty could have gotten up, used the camode in the master bath, as she was walking back towards the bed, saw the kitchen light on and thought "Oh, Ron must be home", walked towards the kitchen-saw the door open, no Ron, and back to check on the kids and noticed Haleigh gone. If she sleeps like most young adults, she was probably out and if she had her back facing the door, possible she did not hear/see a thing.
Second, "IF" I was going to take a child out of the house, I would prop the door open, how else are you going to carry a 5 year old and open a door?
I do not think Ron is involved. I stated this before, but I do think it is a strong possibility that there might be some drug or some illegal activity going on and they might know be telling the entire truth, either for fear of prosocution or even revenge from someone.
Praying for a HAPPY ending!