Add an inspected-evidence flag for each criterion. Set it to 1 only when the buyer has actually reviewed material directly relevant to that criterion; a promise to send it later is 0. Weighted coverage is the sum of weights with flag 1, regardless of whether the evidence is favourable.
The desk’s suggested ranking rule is: all applicable hard gates resolved, no U on a critical criterion, and at least 80% weighted evidence coverage before using totals to prefer one proposal. This 80% threshold is an editorial policy, not a statistically derived confidence level. If coverage is lower, issue clarification requests rather than label the supplier technically inferior.