Browns beat writer Mary Kay Cabot answered a question about the team's RB depth:
I think the Browns are comfortable right now with the likes of Isaiah Crowell, Duke Johnson, Terrell Watson, Glenn Winston and Raheem Mostert. They can always add a back at some point in camp if they need one, but I don't think it's a high priority. I think Jackson is excited to see what Watson can do, and Winston appears ready to try to prove he belongs in the league. With improved blocking schemes and a commitment to the run, I think the ground game will be a force this season.
Cabot said Jackson is especially excited about Watson, who was brought from Cincy's practice squad. Jackson thinks Watson can be an NFL back but right now sits third on the depth chart behind Crowell and Johnson. Seems like if there's an injury, Watson has potential to step right in for significant work but this will all be determined in camp.