"Each transmitted SPI has an index number attached. This number has to be verified in both cockpits to avoid embarrassment. And this brings me to this incident, where I get the feeling that this was not done, and that the MP dropped his weapon on a stale SPI."
Yep, from reading the report and some replies on here that is the missing link.
However the deployment of the GBU-12 was instigated at the "MASS" brief.
Were there no balances and checks applied at this point, nothing that I read in the report gives any indication as to the priority given to releasing that weapon [or not] pertaining to mission success.
?