With the increasing odds that the Titans won't see Jared Cook on the 2013-14 payroll by the passing day, it's high time for the team get a relatively young veteran that can help for a fraction of what Cook will likely ask for. Rosario would present such an ideal opportunity cost for the Titans to utilize.

Pros:

A cheap contract - Rosario isn't expected to ask for much in a new contract as he's been bouncing around the league due to teams not giving him a fair shot. In Carolina, he was supplanted by Jeremy Shockey for the 2011 season. He was relegated to third string duties in San Diego as potential Hall of Fame tight end Antonio Gates and long time veteran Randy McMichael for 2012. The Titans can bring him in to compete with Taylor Thompson and Craig Stevens for a bargain basement price.
He's only 28 years old - It's not like he would be the next Daniel Graham, who was in the twilight of his career when he landed in Nashville. At 28, there's still some years left on him that can be rescued by George Henshaw and company. He can help mentor the aforementioned Thompson for another year or so and allows the team to bring him along slowly.
An utility player - Rosario has shown that he can play a variety of positions, albeit most of it in college. He played halfback, tight end, and fullback along with some special teams while at Oregon. Dowell Loggains might want to use him in a James Casey type role for certain packages.