The whole thing about Yda and Lyse just seemed like an utterly pointless twist that was there simply for the sake of having one. Would anything really have played out worse story wise had the Yda we'd known simply been the original?

She'd still have been an Ala Mhigan wanting to free her homeland. She'd still been devastated by Papalymo's sacrifice and horrified by the actions of The Griffin. She'd still have lost her family to the Garleans. The dead sister would still have been the sister we'd never known. She could still have been besties with M'Naago. Her place within the Scions in relation to the other members and the WoL wouldn't have been any different. She'd still have been the airheaded girl who'd been Papalymo's tag along having to grow into something more.

Maybe I'm missing something?