While there is some truth about these shortcomings of MM, it's the culture that holds the Cowboys back. Every coach that has been hired since Jimmy left has been expected to put band aids on Jerry's roster and somehow live up to his delusional expectations of the Cowboys being SB contenders year in and year out. What's needed is a massive overhaul and a down period of a couple of seasons where a new coach and new GM can change the culture. If you've noticed, every coach that Jones has hired were tempted by the existing talent and the need to uphold the legacy of America's Team.
The organization needs a fresh start and a coach/GM that has the license to remake the team the way Jimmy did.