The Brief Bucs linebacker John Bullock is one of three players to make the Tampa Bay roster as an undrafted rookie free agent. Undrafted rookie free agent linebacker John Bullock is one of them. "I probably wouldn't be here right now if I wasn't a walk-on," Bullock said. MORE: Bucs undrafted free agent Nick Jackson tries his best to make 53-man roster"Just staying consistent every day in what you do," Bullock said. Bucs general manager Jason Licht is also a former walk-on linebacker at Nebraska.