First off, happy Halloween everyone who's celebrating today.  ;D  Second of all, Keri could've easily gone to Whitestone before No'Lien was due to leave.  It takes time for messages to get from place to place, and making arrangements that no one will be able to intercept or talk about if they're hopefully unaware of it is even harder, but not impossible.  Chances are No'Lien leaves shortly after Keri makes his way down to Whitestone, that way you two can go together, and you're able to spend time together on the way to Emon.  Easy fix if you ask me.  :P