The question isn't should we sign him, it's who should we release when we sign him.
The most likely players include Keiwan Ratliff, who has been bad on defense and special teams, Carey Davis, who is a good special team player but has been inactive b/c of David Johnson, Patrick Bailey, another special teamer, or Limas Sweed.
I don't think Sweed should be or will be cut.
My vote is Ratliff. Keenan Lewis or Joe Burnett can replace him in dime packages.