I think there is a lot going on behind the scenes that we don't know about.
What if Cheryl Lee had never come forward and mentioned the Propofol? Didn't Arnold Klein also mention that he heard Michael was using this drug? What if neither of these had ever mentioned propofol? Would they be blaming Michael for forcing some doctor to give him propofol? Are would they be willing to believe that all he wanted to do was sleep and some doctor, be it Murray or someone else, decided to give him propofol? I mean the truth is, in a court of law, you can't prove a negative? Lee, Murray and others can go in there and say that Michael was the one who came up with the propofol. Michael can't come back from the dead and say, "no I didn't...I just wanted to get some sleep".
The average person, including Michael, would not know about propofol unless someone told them about it. If Michael indeed had a regimen of using propofol to get sleep, SOMEBODY TOLD HIM ABOUT IT. Who was that person?