Predicting an undrafted free agent who might make a roster is always difficult to do, but the Tennessee Titans have actually done a pretty good job finding under the radar talent after the draft.
For instance, UDFA Derick Roberson had 3 sacks last year in just 24 pass rush snaps, and to put that in perspective, Cameron Wake had 2.5 sacks in 181 pass rush snaps last year.
Then outside of the incredible outliers like that, you have (or had) guys who make up key depth like Isaiah Mack, Sharif Finch, Matt Dickerson, Dayln Dawkins, Joshua Kalu, and Kareem Orr.