They look really cool, maybe we could use them in a post introducing the ranks? That said I agree with @reds that they are a bit too detailed for a flair.
Could you elaborate on how the proposed change to the samurai logo? I think the white border is actually surrounding the bottom and top part of the sword
Ah! I see. Yeah, it seems that the swords are too big and the flair crops it. I made it smaller and applied it. On my mobile it seems to be good now. Can you check on yours?