No playing time to my knowledge. I think he was cut in training camp by Dallas. But if he can play anything like he did his senior season, he'll easily make the team and might have a chance to get a ton of playing time. Sounds unlikely for a guy signed to a futures contract days after you exit the playoffs, but their safeties are just beyond terrible.
Always liked Will Allen, but he is just not that talented. Seemed to make some mental mistakes this year also, and for a guy who's football IQ is probably what got him this far, that's not good. Mitchell is very talented, but I can't stand seeing him go for the knockout every single time and miss the tackle 9 out of those 10 times. He never, ever, ever just wraps the guy up and makes the tackle. So considering Will Allen is basically a backup who just happened to start, the Steelers could use all the help they can find at the two safety positions. I also always liked Shamarko Thomas, but they clearly haven't seen much from him as he barely sees the field. Special teams captain Robert Golden actually saw more playing time (some at the hybrid LB position he was playing) so Shamarko has clearly shot DOWN the depth chart.