I think part of it may have had to do with Agger eventually staying. Because for a long time it seemed like a first team player had to be sold to raise funds for other players.
Also, as great as he is, we spent 15 million on Allen, and Rodgers may have been told this is your big hitter, and we won't stump up the cash for another player, unless it's minimal like Assaidi or Yesil.