IMHO, the only person with any real intelligence in the whole motly crew is TN. She's been fixing RC's messes his whole life. For me, the first thing that solidified my belief that they are involved up to their eyeballs was the call from Misty to TN that she couldn't watch Haleigh. On the surface alone, when a babysitter says they are incapable of watching your child, what parent worth their title would insist that she does? Especially when there is a backup sitter available? Not one.
When one digs deeper, it begs the question, was that night different b/c Misty was back from a binge, or was that night different because Haleigh was in a coma and needed constant "watching." Why would TN say I'll watch her if it's ok with Ronald, and why would Ronald say no? Again, if the babysitter calls Grandma and says they are incapabale, what grandma doesn't fly over there? Not one.
And why would Ronald say no? Because Misty was already set up to be the one present if Haleigh died. All planned and executed by TN. Sykes wasn't sent there with laundry, she went to see if the account of Haleigh's condition was accurate, if she was "sleeping off" a drug OD, or if she was in a coma. Ron might not even have told Misty that Haleigh had eaten pills, might have just said she didn't feel well and was sleeping, but to watch her 24/7. That's why he called 90 times. Misty probably shut the phone off so she could sleep, having no idea Haleigh was in a coma. She probably woke to find her dead when Tommy arrived at Ron's insistance. Then Ron had them dispose of her, and stayed away till the deed was done, the house cleaned up, ready for him to arrive and call 911. I'll bet my *advertiser censored** that TN was there surveying the scene and orchastrating the coverup before Ron stepped in the door.
They only person bright enough to pull this off is TN. Ron is a bully, the enforcer, if you will, and he has learned how to read cues from TN. Who, btw, accompanied them on their original talk show appearances, to signal Ron to speak for Misty.
And yes, Ron is medicated to keep his mouth shut when TN can't tell him what to say.
Again, this is only my opinion.