My theory regarding this case:
MBM asleep with the baby. Something happened with the other children (accident, neglect, abuse) and DM did something with them before MBM woke up. Once she realized the children were missing, he told her the story of seeing the kids that morning before dozing back off. Maybe he mentioned the sliding door. Maybe MBM believed at first the children really might’ve wondered, but as time passed and she thought critically of her relationship with DM or his parenting of the children, she became suspicious. Maybe she accused him, and his reaction pushed her suspicions further. Or maybe she didn’t say anything, but his behavior after was a red flag to her.
MBM in this scenario would take the baby, knowing what DM is capable of. He has been abusive to her in the past, had possibly harmed her other children, and she was at risk staying with the baby. She left, has been quiet publicly but in contact with police working the angle that DM knows what happened.
Of course this is my total speculation, but I could very much see this playing out, JMO. I really really do not want this to be the case, but my suspicions of DM are only growing with each new development.
