most of the above and then some
pendry proved useless as a line coach, however, capers' loyalty lead him to getting promoted anyways. capers' inability to be a head coach lead to the offense being called by a defensive coordinator (capers himself), and a provenly weak DC (fangio) being given free reign on defense (a read & react 3-4? that's just dumb). the scheme on both sides of the ball were flawed before training camp started each year because of the wrong people being in charge of them. i'm willing to bet that if capers were DC, palmers OC, and we had no head coach that we would've been better off ... instead, all sides were stifled. 2005 is also rumored to have thrown away the entire texans playbook 2 weeks before the first game. the scouting department has been very suspect, and the contracts given are simply rediculous. our first round pick was a project, and not expected to make much of an impact (and obviously didnt). our free agency was pathetic - victor riley?!?! what usually holds teams together despite these overwhelming flaws, is veteran leadership on the field, which disappeared entirely with the loss of glenn & sharper. myself & many others were saying this before 05, we were doomed before the first kickoff.
and i could go on...
edited for clarity.