OK, again not really understanding. For tenderness, you listed 3 characteristics and then said based on those the cook gets a 9. My response is, those aren't biggies to me, just minor factors. I need to bite and chew. So I don't know that I can help you any further unless you also agre that you should not be giving a 9 based on those 3 factors. I am just a bit confused as to your state of mind right now.
I guess I think that if a piece of brisket had absolutely no flavor -- was lacking in salt, pepper, maybe a rub or some flavor -- it was just there like a piece of unflavored tofu -- then that is not a 6, because that is not average. To me, that is a 5 and below average and I write a card saying:"Your brisket had no flavor -- you need some seasonings and to do something to have a flavour profile on this meat." If it is too salty (I mean REALLY salty), too hot, absolutely slathered in sauce so that all you taste is sauce, I give t a 5 and tell the cook exactly why I think it is below average. Writing the card makes me articulate why I think this is below. Moisture also plays into my scores on flavor, so if something has a superior flavor but is dry as dust, that factors into my flavor score.
If I think an entry is just "there" -- ok on seasoning, but not standing out, ok balance of flavors but nothing again is making me want to take a 3rd, 4th and 5th bite, not dry, but not really mmoist, then I give a 6 and tell them just that -- you entry was ok, but I did not want to eat more because X,Y and Z.