As I read through the entire thread, two things come to mind.
1. This is Saban's defense.
2. He has lauded Golding for his football acumen.
Building on those two, and given the problems that this defense has seen in the middle of the field and with RBs coming out of the backfield for years, I believe it's a schematic problem that Saban has been, and may still be, too stubborn too address.
Given the amount of man coverage we play, and how many teams today vs. five years ago have 4 or more receivers running routes on every play, as many have said, it may be time for a defensive overhaul.