@Puzzledandpissedoff you are of course correct. And let's see, Scobie was one of only 3 (I think) handpicked journalists who were allowed to attend MM's last engagement as a working royal. And she kindly phoned him when he was ill to check if he was ok. I bet the other royal correspondents don't get that sort of treatment.
And only two people could have leaked the contents of the correspondence between MM and Prince/King Charles to Scobie. I'm guessing it wasn't Charles.
And who else but the only 4 people in the car - William, Catherine, Meghan and Harry - knew that they drove back to Windsor in silence after the royal walkabout following QEII's death, and leaked that to Scobie for Endgame? IT wasn't going to be W&C now, was it?