IDK man.. I dislike LBJ but dude is built like a brick house. I do expect a lot more flopping from LBJ though. He's dangerous from any position on the court. I see Pau having a whole lot of trouble defending him. Reminds me of when Larry Johnson switched from SF to PF. It extended his career after he lost his speed.
I remember him saying playing PF was taxing when they were playing the Pacers. He's built like a brick house, but defending the post, being the main ball handler, and the closer may be too much even for LeBron. And they're cutting down on flopping so I don't know how much it will help.