This was stated in Trails of Cold Steel 3 when the ship was blown up by a former friend of theirs.
Not all sir, Victor S Arseid did survived, albeit losing his hand. while Oliver too survived, but losing his eyes.
I am happy to hear that but is there any way for Rean to have someone else other than Alisa because personally I think that Emma is equal to the task, and Laura as well.
What do you think?