The most common weak point in a defence submission is not the prime's evidence. It is the gap between the prime's evidence and the subcontractors' evidence. The prime is disciplined, the subcontractors are not, and the assessor finds the gap in the third week of scrutiny.
The corrective is a single library, not a single standard.
Standard against library
A single standard means the prime has written down what evidence it requires from its subcontractors. That is table stakes and does not, on its own, close the gap. Every failed submission this decade had a single standard on paper.
A single library means the prime's evidence and the subcontractor's evidence sit in the same store, refreshed on the same cadence, signed by the same seniority and exportable in the same bundle. The subcontractor cannot maintain its own private evidence and produce it only when asked. The evidence lives in the prime's library from day one.
The uncomfortable part
The consequence is uncomfortable for both sides. The prime has to trust the subcontractor with more visibility into how the library works. The subcontractor has to sign evidence to the prime's standard before it is asked to do so on any specific bid. Both parties spend more time on evidence in month one and less time on evidence in every subsequent month. The break-even point is around the third bid. From the fourth bid onwards the arrangement is strictly cheaper for both sides than the alternative.
The governed advantage on defence work is the library that treats the supply chain as first class from day one, not the library that scrambles to catch up with the supply chain in the last week before submission.
Strategist so-what
Claim. Flow-down on paper is not flow-down in evidence.
Implication. One library, one cadence, one signing standard across prime and subcontractors, from the first engagement rather than the first deadline.