The Detroit Lions are in the midst of training camp, which has its fair share of intense positional battles. Jacob Saylors cementing his spot on the 53-man rosterJahmyr Gibbs returned to practice, but worked separately from the team. The Lions made an RB signing earlier this week, bringing in veteran rusher Raheem Blackshear after holding a cap tryout. Last season, the Lions brought four running backs into the season: Jahmyr Gibbs, David Montgomery, Craig Reynolds, and Vaki. The way things are headed, the Lions' RB room may look very different than it did a year ago.