Indianapolis Colts grab another former 49ers defensive lineman in Sheldon Day  
Niners backup DL Anthony Zettel sign with the Vikings  
Potential free agent target Ndamukong Suh re-signa with Tampa  
Draft scenarios where defensive tackle prospects Derrick Brown or Javon Kinlaw are best player available  
Trade up to insure a top wide receiver?  
Roger Goodell's memo to teams that the draft is still on
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