Player rating for tournaments across all installments of Heroes.

Based on this idea, both participants you are talking about will receive 20 points, even though one of them didn't earn a single point. But they participated! That's why they were rewarded, with an eye towards the future...

No, a purely game-based rating shouldn't take into account any rewards for the future, which may not even happen. It's better to give them Grails as a reward, but not to distort the game rating, that's my personal opinion. After all, that's why Grails were invented :)
Ah, I understand, in the Kiningham tournament, they decided to do the opposite, not to give out extra Grails, but to reward players with game rating points. Is that right?