Maybe GH just wants to live in Miami, but otherwise, they're not a real threat. They don't have a lot of talent to build on. In a very weak East, they couldn't even make the playoffs.
If GH chooses Miami, I suspect it'll be because his family prefers the warm weather.
And when it comes to PG, what attractive players do they have to trade? Johnson? Miami has no valuable draft picks to send to Indy. They don't even have their own pick this coming year.