Just a note Tuon wouldn't be calling mat by his given name she would be calling him his new name. The Kandi i think.

Yo, syed, you are just gonna have to find out

SO the finn might have captured rand. COuld his pattern bending heal the broken fin gate way? COuld Portal stones allow a way in/out of the realm of the finn. I wonder if they have a binding rod in their horde of treasure, it could replace the collars.
If you get a stasis box, you could catch the black wind to trade with the finn. If rand can do that growth thing and sing, could he mess with the finn in their world?