How believable was it? Five months later, he was the new coach of the Atlanta Falcons.

That lasted all of 13 games, before Petrino quit during the season and without telling his players. Well-respected Falcons owner Arthur Blank let it be known how little he thought of Petrino.
What is Arthur Blank well-respected for? For being stupid enough to believe that a coach would remain committed to his team after leaving Louisville just months after signing a 10 year extension with them?