Board Thread:Questions and Answers/@comment-118.211.8.204-20150302141811/@comment-6697950-20150323075420

Kirito has vowed not to use Excalibur for his own needs. He wouldn't use it in a duel if it was only about personal glory. And we don't know what special ability it has. All we know is that it's a unique sword that is supposed to be on a higher level than Eugene's Gram. But whether or not it would change the outcome of the duel is arguable. It's not the weapon that matters, but how you use it.