That is the only thing that concerns me about Ron, you would think the good father would go running to the first possible witness (Misty). WHen first witness has nothing, you move to the second, (RJ). You are right, there is no mention of waking RJ, taking him somewhere safe, asking him where his sister is.
It also makes me wonder if RJ slept through all the screaming of the 911 call. Usually with little kids, if their parents are that upset, they are upset, even if they don't know why. But we don't hear RJ crying in the background in that tape.
If I came home and one of my kids were missing, the other one would be in my arms until i knew that they weren't going to disappear too. It would be instinct.
I really don't want to start doubting Ron, but it's getting harder not to the more time I have to think about it.