Good point but the trick is identifying which players to keep from year to year. These teams (as well as others that build through the draft) tend to well but the trick is to figure out which guys to keep vs which to let walk and then having good evualation when it comes to the draft. I personally prefer the Patriots method of building through the draft but using free agency to not only fill out the depth in needed areas but also in adding one or 2 impact players in free agency that fit the scheme each year (Corey Dillon, Rodney Harrison, Moss, Welker, Adelius Thomas).