You sound suspiciously like every other outsourcer I’ve worked with who breaks something critical. A million reasons why it wasn’t their fault. They did exactly what they were told right and didn’t take one second to validate the assumptions surrounding the systematic nature of the solution. The goal, the mission, the end state solution. That was another departments concern right. That was QA’s concern, that was designs concern, that was the testing center of excellence’s concern. Blame them. The perfect circle of siloed fiefdoms and no feedback blame. The problem is that lives were at stake here on this one and the entire house of cards is coming crashing down if this is determined to be true. There will be public outcry and no matter how many excuses you have the fact is families and lives have been ruined FOREVER, NOTHING ON THIS EARTH CAN REPLACE THEM and something must be done.