What will Mississippi's favorite has-been quarterbacks do next? Agent Bus Cook of Hattiesburg said he thought Steve McNair would be ''amenable'' to playing for the Dolphins if the Tennessee Titans cut or trade McNair. As for Brett Favre, however, Cook thinks his client is either a Green Bay Packer or is packing it in. ''If [Favre] doesn't play in Green Bay, he'll retire,'' Cook told the Miami Herald. "I think he's a Packer for life, and that's just the way it's going to be.'' Cook said that wouldn't necessarily be the case for McNair, who has played his entire career for the Titans organization, beginning in Houston. ''Right now, Steve is a Titan, and he wants to be a Titan, but you don't know what they're going to do,'' Cook said Thursday. "But if he's not with them, I'm sure he'd be amenable to playing for Miami. They've done a good job down there to turn the team around, and he's still a playmaker.''