Alright this has been done a lot, I know. Who's the British person there?
Now I know we site the language of the person as being more modern than someone from Arthur's time period. I grant that as something difficult for my theory to stand up against. However I'm going by two things I have picked up, one from outside the book, one from inside.
In mythology King Arthur was mortally wounded. He's taken to an island to heal, but he must remain there to heal, and return at a later time.... I'm putting emphasis on "must remain there" to heal..
Now the person on the Island said "I need to be here".
That doesn't sound like someone who was locked up. Most locked up people don't need to be there from their own stand point. They want out. Also it was the Lady of the Lake who placed Arthur there. I see a lot of parallels between Mab, and the Lady of the lake. The Lady of the lake provided Arthur with Excalibur, and now it will be returned to DR where this British person also waits... Seems to me things are lining up for that person, and their role in future books...
So discuss, what do you think?