Picking up the child from grandma's might be deflection/distraction from the place where King Jay really was last at?
If the baby wasn't in the vehicle at the store, how do we know he was picked up from grandma's and put into the vehicle to drive to the store?
All CD has to do is pop into grandma's house and call out that baby's in the car so he can't stay in the house long but he wants them to know he's taking baby to the store and everything's fine.
From what I've read, the mom was at work when CD went to the store with the car seat. But what else do we know about each person's whereabouts in the previous 24 hours? All we know is that there must have been a last location where the baby was, and then by the time CD gets to the store there's only a car seat. At some point during that day AT was called or someone met up with her and asked her to participate in the abduction hoax, but she wouldn't really be doing anything 'wrong' because the car was being taken with CD's permission and she was only kidnapping a car seat, not an actual baby...it's just a favor to help out a desperate family member.
But how do LE get to the bottom of all of this when relatives are closing ranks and worried about saying too much in case they drop someone in it?