They aren't talentless. Just at DE unexpectedly after 2011 and backup safety they were. They have solid workhorse backs but need an explosive back as well. Center to Right guard has pass pro talent other than Peterman and but they are way too inconsistent in run blocking. And it's never at the same time. It's always one break down, then another guy breaks down, then Sims unexpectedly breaks down or LeShoure makes a wrong read or slips. It's very complicated. It's not they have all the talent in the world or no talent.
Talent is there. Not living up to your talent happens sometimes too for various reason. Injuries(Best, Broyles, Delmas), being an idiot(Titus Young), unexpected regression (Stafford (redzone), Pettigrew, Tulloch).
And why do people think Gunther chooses not to blitz. Maybe he sees the tape and sees the blitz is ineffective, which when he did blitz it usually was ineffect. Why does he leave the CBs back instead of bump. Maybe because Houston was the only CB who could bump and recover turning his head around and the backup safeties were playing. Stunts were run at times along the Dline but that is one area he could have changed a little bit. Wide 9 gets messed up though when people are out of their rushing lanes. See QBs always being able to scramble against us.