Yes, too much planning, it seems, and hopefully not enough. To free speculate some more... My first take (.25 speed every portion reviewed and reviewed) on the video was that the POI was out of their depth. The dark clad guy who'd been hovering around that end, by the hotel entrance, before the POI enters is just over her shoulder, then there again just as the POI comes back from the elevators, then the watcher walks away and turns his back, odd non-interactive hovering that doesn't seem natural, to me, more like concern and instructional.
The watcher person was a witness, at least, who saw the POI face to face, watched her as she entered the hotel, his gaze following the POI. The watcher walked toward her three times at least, in view on the video, and walked away from POI, to look outside at the cars, walking from side to side, like a doorman, as the POI went to the stairwell. Was the watcher a doorman who saw who came and went? If he was, then why the same kind of gait as the POI and same kind of bulky face covered clothing, maybe just the weather? Why did LE release the video of person of interest ¨1¨? Are there more? There may be.
So, that would mean at least two people involved, if this suspicion about the watcher person is correct. The question would be who David was with before 7:34 pm, since he seems to have checked in at 5:30 pm? It could have been a woman. A woman was reported to have been questioned in MSM. Now, if it was a woman with David before the POI goes up, and this woman who was with David had nothing to do with David's murder, she leaves, then a lookout lets the POI know to go up when the woman comes down. The POI being a woman too, tricks David into opening the door. But then, how do you explain the backstabbing? Maybe the lookout person, if they exist as such, got to David to subdue or kill him before the POI got there? It still seems to me the POI was there to do the backstabbing. Why else? To "strew" stuff?