Going by individual is pointless being that each individual have different strengths. Martial arts are made to be fought in group, hit and run attacks or self defense. Their is no way to find the best group of style by pointing at individuals.
No not at all
1.)Martial arts are meant to be used in different ways depending on the one in question.
2.)As ive said before, judging a group based on their strategic ability carries way too many variable (landscape,weather,leaders involved, etc) its much simpler to go by warrior vs warrior because you're taking what we know of their training/weaponry and pitting them against each other. This takes much less into account and usually gets the idea across.
Saying Chevaliers arent at the top because Orlais lost as a whole isnt a legitimate statement. Chevaliers cant win a war on their own. Thats like saying the spartans werent the highest quality warriors at Thermopylae only because they lost the battle in the end.