I actually think LeFevour is intriguing. Put him in an offensive situation where the QB is a game manager and draft Bowers or Fairley and have a monster D-line, tag Joseph, resign Ced, and I think that team maybe could compete.
LeFevour was only the second QB in NCAA history to throw for 3000+ yards and rush for 1000+ in the same season (Vince Young was first). He's had time to sit and learn. Why not? I'd much rather see the Bengals focus on having a shutdown defense for once in their franchise history.
I saw the Orton rumor also. I'd definitely do a third plus Carson for him if they were receptive. I think if the Bengals draft defense early they just need someone at QB who won't make a ton of mistakes.