Possible but not probable since it's been said that RC had the only key to the house. Doesn't make much sense if it was someone watching your kids and you needed to be gone once in a while with them. You would want to make sure they had a way to lock up and unlock upon return....but, that would be another sign of an irresponsible parent. Total control without any common sense.
If she (MC) wasn't there, she truly doesn't know what happened to Haleigh. If it was Joe that took her, which by the way, I am leaning toward since Tommy did pass the latest LDT. Ron thought it was someone from the drug world and was willing to accept that after about 3 weeks. Pathetic to say, but his drugs came first so he went into protection mode but not for the kids, for the drugs. So, she's protecting him because he was at the point of shooting up so bad that he could have killed himself AND feeling responsible because she knows she wasn't where she was supposed to be but can't admit that or RC would kill her. He's in protection mode because he has to keep his drug world a secret and the supply coming. Nothing can disrupt that so he dries up the tears, gets married, gets a tattoo in tribute to Haleigh, abandons his job, keeps his hand out for all those do gooders that are handing him money and complains about the media trying to keep the focus on his daughter. Eleven months later, he's back into the "business as usual" and gets caught in the sting with the UC cops. That was the last straw for me. He should have never had those kids to begin with but that's a whole other story. So, who's responsible? They all are. Misty for not caring for the kids as she was supposed to. Ron for putting his drugs before his kids. TN for not taking those kids that night. How different would things be now if she had. Tommy for keeping what he knew a secret for over a year. This was a 5 yr. old child? No one was willing to fight for her? It just sickens me. Misty needs to tell everything she knows about Ron and I mean EVERYTHING before she gets totally thrown under the bus that Ron is clearly driving.