It would be really weird to see Michael Ross in a different uniform. He has been with the Titans since they selected him in the second round of the 2005 NFL Draft. He played right tackle his first year in the league, but moved to left tackle in his second. He has been the Titans starting left tackle on opening day every year since. Roos has only missed 12 games during his 10 year career- with 11 of those games coming in 2014.
The Titans drafted his replacement when they took Taylor Lewan in the first round of the 2014 draft, but that doesn't mean he couldn't be a part of the plan for the 2015.
The case for Roos's return
Roos was still playing pretty well before he injured his knee in 2014. He isn't the dominant force that he once was, but he can still be a productive player. He would probably be better than whoever they can sign in free agency. Roos would also bring a lot of experience to a line that is pretty young.
The case against Roos's return
Let's be realistic, the Titans are not going to contend for anything meaningful in 2015. They would probably be better served to draft a right tackle, throw him in there and let him learn. That would set them up better for 2016- the first season they will really have a chance to compete. Roos will also turn 33 during the '15 season and is coming of a pretty significant knee injury. He might not be able to return to his pre-injury form.
Will Roos be back?
This will be a really interesting decision for Ruston Webster. My guess is that he would be open to having Roos back, but of course, only at the right price. Will Roos's people and Webster see eye to on what that price is?
There is also the fact that Roos has been here for a decade and never won a playoff game. He might want to go somewhere that gives him a chance to win.