I'm not sure, Rabbit.
If the guy did this on his own, he was careful but sloppy in some ways. If he skedaddled into the mountains of northern Georgia with a pre-planned hideout, they won't find him for a while. Think the Atlanta bomber.
With all of the "clues" coming out, the only thing I can think of was that if this was a pro hit, every one of those "clues" is possibly a misdirection. And if he was a pro, he is either dead or out of the country.
I'm leaning toward a PO'd amateur. The expensive clothes (Hermes shoes? Really? And a $400 jacket? What's wrong with Wal-Mart stuff, especially if you want to be untraceable) speak to this. Also, the alleged bus ride smacks of mimicking Jack Reacher.
Time will tell.