Oh, I hope you're right. Back when GRRM thought the content of the first three books would fit into A Game of Thrones, whatever Jalabhar is up to would have been scheduled for the second or third book, too, which would make his role in 1-3 seem a lot less like furniture.

All I remember about the Summer Isles is that they're vaguely south-ish. Probably equatorial, or nearly, to get that name (summer all the time!)