I agree and disagree with you, Phicinfan.
This team is not built soley around the success of the "typical" quarterback, but it is/was being built around Vince Young and his skillsets. It is also built around (as all teams are) the need for leadership on the field. Vince Young is, and has always been, a leader on the field. Players simply play harder when he is out there. All he did was win when he was on the field at ever level, including his previous stint as and NFL starter, all the way to his last game before being benched, at which point the team was winning a very tough fought game.
When he was benched, the team continued to rally and was helped by the play of Chris Johnson on offense, which for some odd reason, seemed to surprise most. That and a devastating defense. Those two things together were deadly until late in the season, at which point teams were figuring out the Titans and they needed to rely on play from the QB position, which they were unable to get.
This carried over into this season, where the mold to stop the Titans under Collins was not only figured out, it was mastered.
Last week, Vince Young won that game for the Titans at the end twice. The first time, the rookie receiver coughed up the ball. The second time, 99 yards and 18 plays later, VY put the ball back in the hands of that rookie receiver for the win. Put Collins in that game, there is no way he puts together that final drive, and no way he puts that faith into the rookie who just fumbled the ball away.
many continue to rate his play based on traditional QB stats, something I never understood when rating any quarterback. It goes so much further than that.