:O Ain't so...

Yea Kairi can be be exemption as she does connect the story.... Pocahontas is true princes in a sense that she was daughter to the Chief...So it would make her more of Princess than Alice...

I like your Rinoa idea as well..It would make sense and it'd be awesome if Squall joined in as a forth member... But I guess Disney had to insist that every fourth character should be of Disney stock :P

FYI

Apparently there is going to be worlds for remainder of princesses...