Lol! Sometimes I drive myself mad. ;-)
Here's where I'm going with this. At roughly 4pm (according to timeline posted earlier) RH had a connected call to LH -- not a voicemail call, but an actual call that connected both lines. So we can assume they had a conversation at this point. A Sixty second conversation.
How long did it take you to type "LH: Ok then" - 5 seconds? Ok, so then it should have only taken LH 5 sends to say "ok then". So what the heck did they talk about for the other Fifty-Five seconds ??
No one here can convince me that these two adults - these two PARENTS had a 60 second phone call at the end of the day and never once mentions WHO is picking up Cooper. ---And keep in mind that at this point in the timeline by the time they are both on this 60 second call- Ross has ALREADY texted Leanna about picking up his "buddy" so pure logic says that during this call Ross would have said - hey, did you get my text? Are you picking up my buddy?" OR Leanna would have said "WTH was with that buddy text? Where's Cooper? "
Even if RH had done as you suggested -- if he had called LH at 4:01 and told her he was going to the movies and that she needed to pick up Cooper - and I'm assuming you are implying that at that point LH didn't say "Ok, so you did drop him off this morning?? Cuz I didn't take him..." -- because remember....LH stated that it was a FEAR of hers that Ross would leave Cooper in the car- and if that is true and not some big coverup lie, then she would have likely confirmed that she had not dropped him off that morning. I mean, you don't tell someone something is a big Fear of yours and yet behave in a way that completely contradicts that statement. When something is a big fear of yours, then your behavior most often reflects that fear - you are more hyper-vigilante about that certain area. Think about it - unless she's LYING- she most likely would have followed up on who had Cooper that day, knowing it wasn't her because she's allegedly so afraid RH would leave him in the car.
And another thing about this 60 second call - remember, he didn't text her and say "hey, you need to pick up Cooper" he said "WHEN are you going to pick up Cooper" -- saying WHEN implies the two already discussed the arrangement previously that day, and we know that didn't happen.
And Leanna would have known that previous discussion on the arrangements didn't happen - so it would have taken her a very short time to realize that the 4:04 phone call was completely bogus and a whole big setup - and she would have never made that huge display of loyalty. If Ross said to her on the phone "hey you need to pick up Cooper" and then she shortly thereafter learned that Ross texted her "WHEN" are you going to pick up my buddy" (assuming she didn't see it before the 4:01 phone call) then at that very moment she would have realized Ross was setting up a very craftily planned alibi and would have turned him in for murder.
And one last thing-
-Ross REMEMEBERED to text LH about Cooper just before 4pm
-IF Ross REMEMEBERD to also tell LH to pick up Cooper on that 60 long seconds they were talking - then there is NO way He could REMEMEBER to discuss Cooper's daycare schedule TWICE in a fifteen minute interval and not say "oh s*t!!! I'm the one who has Cooper!!"
Leanna will know he was staging it all if he texted her AND called her about Cooper's daycare within 15 minute interval and yet failed to make the connection on Cooper's whereabouts.
Cuz if someone is THAT negligent of a parent then they need to be in jail anyway.
So what I'm getting at is that something went down in that 60 second call. And if LH wasn't privvy to it, then given all the facts she would have had access to, she would NOT be standing by her man.