With running backs Montario Hardesty and Dion Lewis down with injuries, if you leave Chris Ogbonnaya at the fullback position, the Browns were down to just three running backs in training camp -- Trent Richardson, Brandon Jackson, and Miguel Maysonet.
On Sunday, the Browns re-signed undrafted free agent running back Jamaine Cook. Cook originally signed with the Browns following the draft. He went to high school at Midpark and attended Youngstown State. Cook was one of the players who tried out with the Browns back on April 12, when they held a workout with 14 local players. The Browns waived Cook back on May 14 after they had claimed Maysonet off waivers from the Philadelphia Eagles.
In terms of size (5-9, 210 pounds) and speed, Cook is probably more similar to Lewis than the other running backs on the roster. With him signing this far into the preseason, though, it's hard to imagine him being thrust into a contributing role right away -- those reps will likely go to Jackson, and Maysonet could very well see a preseason bump in playing time too. Cook did have attempt 32 kickoff returns in college, but only averaged 19.2 yards per return.
To make room for Cook, the Browns released safety Kenronte Walker, a move that makes sense in terms of numbers. He was on the third-team defense at safety, along with Kent Richardson, so one of those two guys were candidates to go. Cleveland has been fielding five safeties in these first two preseason games, so this would seem to put them down to four. However, T.J. Ward and Jamoris Slaughter could both be ready to return against the Colts this Saturday, so that bolsters the number of healthy players at the position.