If the Cards sign Bell, and they are looking to improve the OL, I draft two OTs and cut Bridges. If Bell gets injured either Massie steps in or Browm slides over. If Brown slides over Snyder steps in at RT. If DeCastro gets injured Snyder steps in at RG. If Colledge gets injured, either Kelemente slides in or Snyder slides over. It would be a very versatile group. We would carry 9 offensive linemen if Long wasn't on the practice squad, and would have backups at every position. (DeCastro/Kelemente/Snyder at OC)
As far as the P goes, the biggest openings would be Broyles, Franklin, or Long. Ideally, I hate the thought of taking a P this year in the draft.
As far as ILB, keep in mind that LBs are rare in that they can cnotribute on special teams while you are waiting for them to develop. Franklin would beat out Reggie Walker in my opinion or cause the team to cut Bradley (though I doubt it).