User blog comment:Wikiyous/If Lyfa was in SAO?/@comment-1173941-20130123200005/@comment-4631119-20130125164509

Well, whatvere the answer is, the appearance of Suguha in the series, and their meet with Kirito, whether soon in the game or later, will absolutely give a hige change to what happens now. Like I said, having Suguha in SAO will obvoiusly create an "alternate route" for the series, up to the way we might never considered before. :)

In my own imagination, even Kirito married Suguha instead of Asuna both in game and in RL (since cousin-marriage allowed in Japan) might also possible if Sugu ever at least once stepped to the world of SAO.