"When the Tennessee Titans offense takes the field Sunday against the Jaguars, it will feature one of the NFL's elite running backs, one of the league's more promising wide receivers and a quarterback who has guided a team to the Super Bowl.

On the sideline, a Super Bowl-winning offensive coordinator will guide the show.

Sounds like a pretty impressive combination.

But there are plenty of unanswered questions about the Titans offense. Maybe the most pressing: How quickly will a handful of recently assembled parts become a smooth-running unit?

"I don't have a whole lot of high expectations for the Titans offense this year," said Fox NFL analyst Michael Strahan, speaking just before Chris Johnson received his contract extension. "You've got a new passing game being put in, a new quarterback, you've got a lot of guys trying to prove themselves … So to be honest, I don't have very high hopes."

Johnson's return after a 35-day holdout changes matters, but it's easy to see why many observers might not have an especially rosy outlook for this offense.

Start at quarterback, where Matt Hasselbeck arrives from Seattle with a good 10-year résumé and a reputation as a strong leader. But he hasn't had to learn a new team's offense since 2001, the year he moved from the Packers."