I'm biased here, but I would like to see Jake Knott come in for a tryout. Was an animal in college and was one of the best LBs in the country. He was also part of arguably the best LB duo in the country. Great, great tackler with great instincts with probably average coverage skills.
Problem is he hurt his shoulder really badly a couple of times his junior and senior year. He was really tough and played through it most of the time.
He's was cut by the Eagles recently, I'm assuming because he got a 4 game suspension for PEDs. He says he isn't aware of taking any, but I think it was likely something to strengthen his shoulder, which could have been a great move.