Duke Edmund's promotion of Louis was not merely because he fought brilliantly; there were deeper considerations involved.
In this campaign, too many Pioneer Nobles from the South died, arousing dissatisfaction among the Southern nobles.
Everyone knew well that those dandies came to the Northern Territory merely to fulfill a task and seek lands.
But when a bunch of them dies all at once, it's hard to explain away, inevitably making others suspect that the Northern Lords were deliberately "using a borrowed knife to kill."
Promoting Louis, a Baron of Expansion from the South, was the best response.
It's not the North being exclusionary; it's that you are too incompetent.
If you had half his skill, you would have survived and achieved merits long ago.
Instead, Louis picked up the slack from others.
So, Louis calmly stepped down from the high platform.