Depth To Trade?

Anwar S. Richardson made a comment in his last blog entry on TBO that I don't quite understand.

My guess right now is Buc GM Bruce Allen is adding lots of depth in order to pull off some trades down the line. They obviously were not happy with the talent available on the free agent market and believe this team can be improved through a different approach.

The second sentence is fair enough, I guess. Teams really are spending a lot of money on free agents that wouldn't have commanded as much in a deeper season, although there has been at least one top-tier player available at every position except quarterback this year. But the first sentence puzzles me. The Bucs are acquiring depth to make some trades later? Which players that the Bucs acquired this season have any trade value at all?

And if they were acquired to replace a current Bucs player that they will trade, who would that be? The only one I can think of is Brian Griese replacing either Bruce Gradkowski or Chris Simms or both. Maybe those guys have a little trade value, but not much. And will they get more for them than the 2009 sixth rounder they gave up to get Griese? Maybe one of the linebackers the Bucs just got will replace Ryan Nece as the Mike backup. But what's Nece worth? A fifth rounder or an equivalently valued player? I'm not seeing the point. What trades are the Bucs really in a position to make, assuming they aren't in the market to give up any of their already-limited 2008 draft picks? Stop messing with my head, Anwar S. Richardson.