Board Thread:New on Sword Art Online Wiki/@comment-184.94.179.193-20170401200521/@comment-28391659-20170402105155

Actually, he obtained the Dual Wield skill first, which encourages him to get another sword to be a pair with his sword at the time, Elucidator. And the another sword turned out to be Dark Repulser.

He obtained Dual Wield skill because the system deems him to be the fastest player in the game, hence giving him a unique skill, the Dual Wield, not because he obtained Dark Repulser.