I noticed that both of the babysitter's stories about Quinton getting out of the house recently included his brother:
McCarta, who had been watching Simon’s three children for about nine months before Quinton’s disappearance, said her 16-year-old daughter found Quinton and [brother] alone in the family’s full-size backyard pool over the summer. The children cannot swim.
...
The pool incident was not the only time the toddlers had wandered off. A month ago, McCarta said she found Quinton and [brother] playing alone in a ditch two feet from the busy roadway in front of Simon’s home.
Quinton Simon's heartbroken babysitter exclusively told Fox News Digital that the missing Georgia boy was neglected and now she fears he may have drowned in the family pool.
www.foxnews.com
So the pattern seemed to be that Quinton would leave the house with his brother while Leilani allegedly slept. Would he leave by himself? Would his brother go out with him then go back to the house alone? If Quinton went underwater in the pool would the brother go wake up his mother?
IME little brothers and sister tend to follow their older siblings around but it may not have been the case with Quinton and his brother. I dunno, I guess it's just another little seed of doubt. I wish something would move in the case.