Hmmm...how about we skip forward to where Meetra is being held? The team can infiltrate where Meetra is being held to find Arcann and Vaylin waiting for them. 

By the way, did we talk about:
-Where Meetra is being held? I imagine that they wouldn't keep her somewhere easily accessible; maybe on a remote base on Zakuul somewhere? It could explain how Revan found her without having to comb the galaxy. 
-How Valkorian is involved in this? Will he be a figure in the shadows, permanently dead or active in some fashion? IIRC, Valkorian used basically an avatar to be the Emperor that the JedI Knight (in our case, Voldon) killed in JK storyline. That would mean that Valkorian could still be alive somehow.