Posted by ESPN.com's James Walker
But are they good enough to make a difference?
Yet ironically all four players have a shot for much bigger roles in Cleveland, which provides a great opportunity to shine but also demonstrates how talent-deprived the Browns are.
Bowens and Elam, a restricted free agent, have a chance to make the biggest impact. Bowens has 32.5 career sacks and, despite starting just seven games the past two years, he should start for Cleveland right away. Bowens can play both inside and outside linebacker with the Browns, replacing players such as Leon Williams or Alex Hall.
Poteat would have to beat out one of Cleveland's young corners in Eric Wright and Brandon McDonald. But at the very least, Poteat, 31, can play the nickel and teach Wright and McDonald the nuances of Mangini's system. Mosley was signed to provide depth on the defensive line, which is also an area the Browns will address in the draft.
All four signings are not overwhelming but could turn out to be solid. And when you're trying to completely rebuild a roster, that's not a bad thing.