I put your theory to the test myself...
You consider Nightmare Caine to be entirely undeserving of truefighter stature. In comparison with your own combat worth, slaying Caine would provide an almost indistinguishable change in attack rating but the overall morale of the realm would increase considerably. Caine is not a combat peer, and indeed, will in all likelihood never be one.
WHAT a fantastic skill!
Written by my hand on the 10th of Skyelong, in the year 1313.