I thought Greenwood played SOLB? Maybe I'm wrong but if not Greenwood>Roth. I'm not suggesting we bring him in, I think the draft will take care of that, but its not that insane.
*edit* Nevermind, I just remember that Greenwood played ILB 3 years ago when HOU ran the 3-4. He played Strong side in the 4-3.
So Greenwood or Crowder is what it really would come down to.