I get what you are saying, but I disagree. The secondary, even if we didn't count Teague, will have much more experience than the WR core for 2011. Janzen, Waggner, Gordon, and Brewer all played in all 13 games and started at some point during the season. Out of the 13 interceptions our DBs recorded last year, all of them were recorded by DBs that will return for 2011.
On the WR side of it, we lose Moore, Jones, Stocker who accounted for 141 catches last year. The return WR core of Rogers, Hunter, Rogers, and even throw in Rivera is just returning 52 catches.
It is obvious that we have much more experience returning to the defensive backfield than to the receiving core.