
Remember when the Chaos Sorceror stowed away on the shuttle? His plan was to wreck the engines and keep Chaz and friends away from Kuran. He was killed before he could do it, but the battle wound up crashing the shuttle anyway.
When do you think the Chaos Sorceror boarded the shuttle? Was it on Motavia, before the launch? If so, shouldn't Demi have been able to detect him before the shuttle took off? Could he have instead been hiding on Zelan and slipped aboard when Chaz, Rika, and Rune were talking to Wren?