Oh, I didn't know that about the dragon slayer. And now you remind me of one thing I missed. I didn't do the last tournament battle!
EDIT: Well... in any case, that doesn't impact the score. I did the battle, got the sword, but it's all the same
EDIT 2: As for the inquisitors, there are 5 places in darion where they can spawn - the mage tower in greenwort, the mage tower in velarion's forest, furious paladin house, temple of deceased souls and enemen's castle in the marshan swamp (after you beat up the boy). If there are no inquisiotrs there, I guess one consider himself very unlucky with the game setup