well before you let your Ozzie hatred cloud your judgement of bama defenders and lead you to use excuses like "they won't play well if they aren't surrounded by elite talents"(a frequently used and quite silly excuse), realize that saban isn't just scheming the best defense in the nation, he is recruiting top talent, that talent doesn't just fade away because they're surrounded by other top talents, and to say bama defenders are bad because they're surrounded by elite bama defenders kinda just proves the point that they're all good talents.
So far you have: Humphrey, foster, Collins, a'Shawn and Allan Robinson, jarran Reed, Mosley, Kirkpatrick, and HHCD, all playing at a respectable starter level, all living up to, or at least close to their draft billing(Kirkpatrick probably being the most disappointing but he's improved), that's the first 3 rounds since 2013, so far the only ones I can think of in that range who have done little to nothing are tim Williams and Ryan Anderson.
Disclaimer, this was 100% off the top of my head.