Who is your dark horse to make the roster and why?

[*ochocincos*]

We all know there are some definite locks to make the roster. That could be draft picks, key FA acquisitions, or veteran starters.

However, there seems to always be at least one player to make the roster that many did not expect.

My dark horse is Sean Porter. Many Bengals fans don't know a thing about him. Prior to going to IR the past two seasons, he was a fourth round pick out of Texas A&M. In his rookie year in 2013, he had a torn labrum in preseason, and in 2014 he went on IR in early October with a knee injury.

However, coming out of college, Porter was very healthy and productive. He showed that he could be a very effective pass rusher, but he also showed good coverage ability and run defense when A&M switched to a 4-3. His skill set shows versatility to play any LB position, but he would be an ideal candidate to be a SAM on a Marvin Lewis team.

Porter is up to 242 lbs now (229 when drafted), so hopefully he's added even more muscle. This is a make or break preseason for Porter, as he needs to stay healthy and impress enough to stick to the roster. However, with the lack of talent on the back end of the roster at LB, I think Porter has the talent to impress enough to be the last LB to make the roster and give the Bengals that ideal SAM with pass rush ability that they've been seeking under Marvin's tenure.

Who is your dark horse that you think (or hope) makes the roster and why?