There are so many variables we could discuss about reasons why there will always be discrepancies in grading.
1. Graders use their own interpretation for clarity of card
2. Graders might spend to much time on a card to look busy and over grade it.
3. Graders might be rushed and don't spend enough time and under grade it.
4. Political as it does matter who submits the card(s)
5. Slabs can be altered.
6. Slabs can be bought (back door or from factory over seas) and fake labels be made.
7. Graders and human.
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