I only recall 3 sacks given up unless it included the postseason which I still don't know how it is 6. Regardless, he's a top 3 LOCK. PFF absolutely RAVES about him and with good reason. He makes Arian Foster look better than he really is. There's a reason why Houston only averages 3.5 YPC on the right side opposed to 4+ on the left, that reason is Duane Brown.
I'm a Texans fan and Foster is absolutely NOT a top 5 running back. Johnathan Joseph was a top 5 corner last season but he got beat pretty often this season. Chris Myers is a top 3 center. Brian Cushing is pretty easily a top 5 ILB. I'd only take Willis and maybe Derrick Johnson over him. Andre Johnson is still top 3 in my eyes. He has ZERO help, seriously and he has a noodle-armed quarterback.