Regarding the briefing part I would be careful.
As the observer will know they didn't sit in the pre-match briefing so they may have slipped it in to their debrief questioning to you without you noticing "did you brief this to the assistants".
Or they might have asked one/both of the assistants without you knowing: "was this mentioned in the pre-match brief".
So you might put your appeal in, and have it immediately dismissed for the above two reasons.
As the observer will know they didn't sit in the pre-match briefing so they may have slipped it in to their debrief questioning to you without you noticing "did you brief this to the assistants".
Or they might have asked one/both of the assistants without you knowing: "was this mentioned in the pre-match brief".
So you might put your appeal in, and have it immediately dismissed for the above two reasons.