Wanted Seymour but his demands are insane.
Why not bring in Jerrell Powe, Trevor Scott, Lawrence Jackson, S or Ronnell Lewis. All recently played for 4-3 teams (TB, Detroit) in 2012. Lawrence and Scott at least have had decent production thru career. At the very least Lewis would be an upgrade at ST over guys like Edgar Jones, Kyle Bosworth, Orie Lemon or Cameron Lawrence.
As for change of pace backs, Joe McKnight, Miguel Masonet and even Kendial Lawrence are still out there. McKnight is the best fit and most likely to provide immediate impact on offense & ST because has played for Callahan.
And LB depth is thin, Cowboys need to be as aggressive as they are with DL, I would bring in guys every week, work out nasty run & chase butathletes like Keith Pough, Quan Sturdivant, TaylorReed, Sean Loiseau and even young "busts" like Aaron Curry, Aaron Maybin and Sam Mountgomery. Could unearth another Selvie type. Immediate impact 4-3 vets like Brian Rolle, Tim Shaw and Gary Guyton are plug and play guys who can run, cover and hit with 4.5 or better speed.