1.) Yes, but... even with the backups in the secondary, this defensive backfield looks to be significantly stronger than last years. I believe the front 3 will be better too, even without the starting NT. Van Noy and Sorenson are huge losses which can't really be replaced, but I believe that the improvements in the other areas of the defense mean less overall gaps and weaknesses than last years defense.
2.) Got nothin'... good point.
3.) Even though he was underwhelming in the scrimmage, there've been a lot of reports that Hill's had an exceptional overall fall camp.
4.) I'm actually stoked about the new blood on the OL, I believe this will be a big upgrade from last year's team. The fact that Koroma was able to earn the center position over more experienced players is impressive. He's a little undersized, but center is the one position on the OL where it's not as much of an issue.