Dana is making the re-match because he sees an opportunity to make a shitload of money. That was a damn good fight, the re-match figures to be a damn good fight, and Pettis has the ESPN top ten highlight. As long as he doesn't fight again, he's totally sale-able.
The most money lies in re-match, and promising Pettis a shot at the title no matter how it comes out. If Edgar is going to be out for a period of time, make Pettis-Maynard for an interim belt.
As for Pettis right now, $50,000 or so in his bank account should take care of any lingering resentment.