See this just doesn't seem consistent with what we actually see in the game. I mean, there's tons of talk from a lot of different people about the importance of bloodlines. No one talks about "the biggest asskicker gets to make the decisions."
Hehe, that's why I said it's could be a really old tradition, one that goes beyond Calenhad's legend all the way back to the barbarian warlords. A tradition that no one would consider if it weren't desperate times.

In my mind Alfstanna says "It shall be fought according to ancient tradition...". I think, it's a nice addition to the lore. :D

Of course, YMMV.