They don't usually lose this many guys. Harv is right, they let a lot of pricey players walk, plus Shields isn't coming back.
The Packers have been second lowest in League on number of active signed players the entire offseason. There were not enough draft picks to fill the holes.
I said earlier and Dougherty wrote about it for packersnews.com that Ted decided his vets needed upgrades, especially on defense.
I think he still sees those upgrades as coming from within, but they needed depth as well. Only exception so far was TE and CB. I think House might start.