1. That's technically debatable since all the FF characters as well as Mickey, Donald and Goofy took part in fighting the Heartless army.
8. Sephiroth isn't really canon.
9. No, they just stopped the battle. If Sora really did win, you would see LS being weak at the end but instead he just stands there like nothing happened. He just realizes Sora isn't Xehanort and then just kneels down.
1. you still had to take out 1000 by your self without their aid.... >_>
8. 1 yes 2 is debatable
9. armor filled with emotions cant really fatigue.....