   DALLAS — Clint Chelf plopped his newly acquired hardware on
the table next to Mike Gundy.  Not-so-subtle hint?  It might've
looked that way in the news conference after the Heart of Dallas
Bowl, but the truth is, the Oklahoma State quarterback knows he
didn't need the game's MVP trophy to remind his coach of how
valuable he's become to the Cowboys.  The on-field body of
evidence continues to grow.  In a 58-14 bludgeoning of Purdue,
Chelf completed 17 of 22 attempts for 197 yards and three
touchdowns. His hold on the starting quarterback job has grown
even stronger.  Which begs the question — has he earned the
starting job for next season?  Gundy wasn't ready to answer that
question Tuesday.  “But Clint has finished the year strong,” he
said. “We're going to work our quarterbacks just like we would
any other position, but when we start out in the spring and they
go running out there, Clint is going to go running out there
just like he did today.”  As the starter.  The starting job is
Chelf's to lose.  There