Exactly. Every season EVERY team is going to have some uncertainty about how new players will fill in at new positions. Seahawks, 'Boys, and Pats just took some hits too.
To build off of Steve, Tramon is the only player of significance the Packers lost off of that "gelling" defense. Hawk, House, and especially B. Jones made marginal to insignificant contributions. If Ganja Guion signs, we have essentially the same roster returning that just came within 4 minutes of the Super Bowl. Obviously re-tooling is needed, but it's not like we're the Jags or Bears.