Absolutely, the COs are to follow the signals of the on-field crew, even if the signals are incorrect. The on-field crew must take full responsibility for those clock errors. A CO will make note of perceived errors, and, if challenged, will offer his report of the situation(s).
If I was the CO, I wouldn’t do anything until somebody challenged me. But, I’d be armed with my details of the events. Unfortunately, video rarely picks up the R’s ready signals, so you might not have that as support.
I just wish I 1) always had separate GCO and PCOs, and 2) had fully trained and knowledgeable COs.
Most of the time, we get separate operators, but not always (like last night). But, we’re struggling to get PCOs that fully understand the 40-second clock.