PS this trade is almost identical to the one we did with NE in 2007, same pick (28) and our fourth rounder is also #110 (however, we do not know the # of round 3 compensatory picks). SD does this because, without Dan Williams (they need a Nose tackle BAD) and rather than trading up, they gain valuable assets for the future, seeing as they do not need the picks now. Then they pick Ryan Mathews in round 2 and find a suitor for cromartie as they gain more future picks.
With this plan we fill all needs; improve our last ranked O-line, give a boost to our special teams, get another weapon on the offensive side, find a replacment for the constantly injured SS micheal lewis, and improve our pass rush and pass D in total.
So our draft looks something like this:
1A CJ Spiller
1B T Willams
1C B Graham
2 Chad Jones
3 V Ducasse
5-7 BPA
This fills all needs while still getting great value and improving for the future.