I remember when Antonio McDyess first practiced in Detroit, he made particular note of the fact that LB's defensive system was more complex than any he'd ever seen, and the amount of attention payed to defense under LB was beyond any experience he'd had in his career.
Flip is an awful defensive coach, and nothing he ever said to the media during his tenure in Detroit leads me to believe that he cared about defensive basketball - except, of course, when he was specifically pressed on the issue, after which stories about his legendary defensive practices emerged. Any failure was blamed on poor offensive execution or shooting; or maybe minor coaching mistakes had been made, and vague promises of corrections (not one of which did he actually keep) were issued. Even in the regular season before his beloved offense melted down, statistically the Pistons' defense was mediocre and any observer could see that it was undisciplined. Flip couldn't design an effective defensive scheme, he couldn't adapt to any adjustments opposing offenses made, and most importantly he couldn't motivate his players to consistently apply effort and discipline on that end of the floor. I don't care how rigorous his practices were, because the only results that matter are the ones shown on the court in-game, and those results expose Flip as a fraud.