Lynch is a loss no question. Forsett is a good backup, jackson, hawkins, and jordon are all very fast good wide receivers. That was nate's first div 1-a start. Trust me he looked damn good the majority of the rest of the season. Particurally at home. I bet ainge didn't look fantastic at times his freshman season. We do lose mebane, bishop, and hughes, but beyond those guys it was a very young defense. With the rest of the defense returning, I see the team defense being better.
As for your WR and secondary. Very rare, no matter how talented, is the player that can step in and dominate his first game ever. I'm sure your guys are good, but to not expect some dropoff the first game of the season is unrealistic.