I agree with some of your assessment and differ with others.
I'll start with the broader agreement. Team cohesion, whether college football, military or corporate is always reliant on the mutual trust among the team members. This trust must be, from origin, fostered by the HC, Generals, CEO and other leadership. The trickle down effect at the individual contribution level requires each part (PART) of the team believe in the others (PARTs) ability to do their job and do it well.
Marketing counts on sales to follow up brand awareness and product launch, sales counts on operations to do their job daily and on engineering to provide good product, etc.
At the broadest level, D counts on O to score and O counts on D to stop scoring. RB and QB depend on OL to provide running lanes and time. WR count on QB to get the ball to them and OL to give them time to do so.
Which is all logical. However, given the NFL approach of Sark in the spring and summer, all parts had to take it on faith that this would occur. It didn't, not surprisingly and so faith and trust in the upper management and their fellow (parts) suffered greatly. Instead of building that trust in practice in off season it was occurring on game day. Management also failed because they assumed the parts would work. They didn't, so they too had to adjust, during actual game and based on game results.