If you are honest with yourself and you have at least a decent level of skill you can spot good players.
I played three games in the KOF tournament at NEC my first match was against a guy who told me he had never played a KOF game in his life and the second was against Reynald. Which game did I learn more from? Honestly neither. I had just player a human in KOF XIII for the first time about an hour before and as scrubby as I was it was still no challenge beating someone with no KOF experience. On the opposite Reynald was so much better than me he OCVed me both games without even trying. I wasn’t even able to analyze what beat me at the time. Even at majors the competition level can be random
Its as important as execution or spacing to be able to accurately size up your opponent’s strengths and weaknesses at a tournament, more than anything else your question shows that you need to work on that, if a match is legit and a good fight you shouldn’t need someone else to verify it, even if it is at a con.