I'm starting the next story today, aptly called "The Ruby Knight", whom I expect to be Sparhawk, as he holds both rings now. If I encounter an explanation, I'll post it.
I read these books about 10 years ago, but out of order: first The Tamuli trilogy, then The Elenium (wrong way around), and they were in Dutch. I don't remember too much, except for the general story line, so it's all "new"....
Thanks for replying. Having two people telling me that there will be an explanation somewhere is enough; as said, I'll post it once I encounter it