A far more viable theory could be that Yda could've been captured by the Garleans. If she was an Echo-user, she could've even been the starting point for the whole artificial Echo gene therapy thing that we see going on. Possibly still kept in one of those tubes like Krile was in. Maybe mind-altered to be an enemy to fight later too, given the lack of scruples the Garlean bio-science division seems to have... but even that's stretching just to have Yda alive for some dramatic reveal of it later.
... That said, if that actually does end up being a thing that happens, I'm going to point back to this post and say "called it" with a laugh of disbelief.
... That said, if that actually does end up being a thing that happens, I'm going to point back to this post and say "called it" with a laugh of disbelief.
~