Ken Whisenhunt: We’re fortunate to have Zach Mettenberger

Several months ago, people bandied about whether the Titans would pass on an opportunity to draft Marcus Mariota because they had Zach Mettenberger on the roster. That didn’t wind up happening, of course, and the Titans didn’t bother with a “competition” this summer, which leaves Mettenberger backing up a quarterback that everyone in Nashville wants…