Snipped from previous comment:
"The notion of adding in an element of a large unwieldy piece of furniture to a crime directly related to murder makes no sense to me. If you need to dispose of something, you grab a bag, not a dresser. "
If he had been out "ransacking" and stole the dressers at say, 11pm., returned home and woke up little Mariah who began fussing (he may have taken his frustrations out on her). He may have placed her body in one of the dressers and hauled the dressers (one containing with her body) out to where he dumped her. He then returned home. LE found evidence she had been in one of the dressers and proceeded to tie him to the dressers in order to arrest him and keep him from fleeing "until" they could PROVE he was responsible for her disappearance and ultimate murder when they found her body.
In other words, he may have stolen the dressers earlier, came home, Mariah was up and awake (the first story said he told her to go back to bed at midnight), she refused and was fussy which he feared might awaken her Mom. He attempted to "quieten" her and killed her in the process. The dressers were already there in his van/truck. Dogs may have picked up her scent in those dressers...and the rest is sadly, history. JMO.
It's hard to believe anyone could have moved around in that trailer (in and out twice), without waking up Mom. Unless, someone tried to keep everyone quiet, including little Mariah?