You're right. The deal would have to be worth it to pass on a guy like Spiller. If it isn't, perhaps then we would have no choice but to draft him. I still think, again assuming the players mentioned before are all off the board, we could get good enough value out of a trade down to address our needs. This draft is one of the deepest at all around talent in years. There are excellent players to be had in the 2nd, 3rd, and even 4th rounds.
Either way, should this play out, it will be interesting to watch. That's to say until no offers are made and the Bills simply pass on Spiller and pick up a DB with #9...