Sorweel's development as a character was probably my favorite in this series, perhaps the entire 7-book saga so far, despite my initial distaste for him. I absolutely loved that the WLW was brought back in this way-- especially so suddenly that you simply think he's gone insane at first. It makes perfect sense... of course Yatwer would find a new Warrior to use as soon as she could. You just don't expect the WLW to be brought back after its defeat in TGO.
It may have been my favorite arc in the book, actually. Damn, it was good. That being said, I kind of hope that's where Sorweel's story ends. It was so fitting, I think, to have him finally become the assassin he thought he was and ascend to heaven (if that's what happened...).