Once again, what does a claasic have to do with the discussion at hand? Are you implying that every high quality release has to be deemed a classic? If so, that's insanely foolish thinking especially when you compare the total number of hip hop releases compared to the low amount of "classics". You're AG logic is extremely flawed because if that was the case Carter 4 would be overrated because of how bad Carter 3 was. HHID would be overrated because of how bad SD was. Recovery would be overrated because of how bad Relapse was. I can go on and on.....
You're confused. First, SD is way better than KC. But second, and more importantly, Carter 4 didn't do what AG did for Jay-Z because C4, like C3, fu*king sucked. It was actually worse than C3.