Board Thread:General Discussion/@comment-75.27.105.179-20150316062106/@comment-73.81.120.246-20170218191214

One: Alfheim does not have a Sword Skill system as Aincrad does. There is a system that allows users to create their own techniques based off of their own skill. Meaning, Kirito does not have access to Dual Blades in Alfheim. He can dual-wield two swords, but he can't pull off Dual Blades Sword Skills like Starburst Scream and The Eclipse because they are beyond his ablitiy to replicate in Alfheim without the pre-programmed System Assist. The best he can do is Double Circular.

Two: This is addressed in the Q and A, where Kirito states that he doubted that he'd win against Yuuki even if he used two swords. Again, Kirito acknowledges that Yuuki is stronger than him.