Well, Aang not waking up could be as simple as Sokka and Katara taking a left instead of a right on the day they found him, or Sokka not making Katara angry when they're near the iceberg.  It could be something extremely simple that could alter the future without the need for something as elaborate as time travel.<br/><br/>How do you feel about an Asami without the time travel?  Asami who was born and raised in the current time era but just as gifted as Sokka?<br/><br/>I just think that if you're going to add time travel into the game it needs to be a large plot device and not something buried in a character's background.