It is hard arguing about a curse, which is superstitious. If it were provable, I would have stolen and set Rowdy's costume on fire decades ago.
What can be discussed has been Jones' long standing, dogmatic refusal to hire qualified football managers since Jimmy Johnson's departure. As the franchise owner, Jones holds absolute power over personnel decisions. He has always had the opportunity to hire qualified individuals with a different managerial perspective. Having absolute power means Jones could have fired any general manager hire after several seasons. After one season. After several games. Heck. At any time, Jones could have held a press conference announcing a new general manager during the morning and fired the new GM that same evening. He is an NFL owner. His control is unquestionable.
He is a living contradiction. The same business individual, who capitalized magnificently off the field and enriched the entire league, never implemented the same sound business reasoning for overseeing football operations after underperforming as GM soundly within five years after Super Bowl XXX. That is what logical minded business people do. They move from an underperforming manager to someone they believe can deliver better results. It is what he said should have happened to himself, although his public confession was another lie.
Other GM hires could have failed. They could have underperformed even worst than Jones did at times. No one will ever know because Jones willfully killed those possible negative outcomes as much as he snuffed possible successful outcomes. His near 30-year inflexibility speaks directly to the mentality of a person, who has been (and continues to be) perfectly okay with sacrificing possible championship success for the sole benefit of personal satisfaction.