I tend to agree that he'd likely coach the Heat, but not the Lakers. And it's not so much an issue of loyalty; I think it's more of an issue with common sense.
Kobe turns 33 this year, Odom turns 32, Artest turns 32, Fisher turns 37, and even Pau turns 31. They may have a year or two longer than Boston, but not much more. And after this disappointing exit, they may be getting blown up anyway.
It's not worth Doc tarnishing his image to have this blow up in his face.
Now Miami's a different story. I hate to say it because I hate the team, but he'd probably be a perfect fit there.