Most important skill in battle is teamwork. You can be great at the mechanics and also great at teamwork (it certainly helps), but the inverse is not necessarily true. The best duelers aren't always the most useful people in battle. There is some correlation obviously, but not entirely. Passable cog in the machine that plays his role>suicidal hero who thinks he can always take on 5 people and charges recklessly, or doesnt pay attention to ranged, or cav, or anyone he's not currently hacking away at.