The main llm will refuse to scan for issues flagged or not, and the cheap model not do a good enough scan on its own.
For models designed/marketed for cybersecurity defensive uses, any predictable refusal mechanism is a vulnerability. It is like being able to cause a kernel panic or segmentation fault .
Even if the gate is fail-reject, an attacker can overwhelm HITL reviews with many false positives and use DoS vectors here.