I'm reinserting a couple of quotes from your post since they don't carry over when responding:
Det. Farmer: Wesley asked Sherin at around 10pm if she was still awake, she said yes. He asked her: Do you want to finish your milk? Sherin said yes, so they went into kitchen until midnight, then went into garage where Sherin died. Wesley went from concerned to frustrated.
Det. Farmer: Wesley demonstrated to police how he was yelling at Sherin, appeared frustrated. when he yelled she would drink, then couldnt drink, then forced her to drink milk while she was standing and she choked.
I don't believe version 3.0 either. Wesley had Sherin in the kitchen from 10pm until midnight then went into the garage with her? That's an awfully long time and a lot of information is missing, hopefully because LE isn't ready to show their cards.
I can't shake the dismal thought that there's something more that we haven't heard about. It seems like more and more murderers are realizing that the longer their victim's body is not found the better the odds of lost evidence and a COD of "undetermined." IYKWIM.