You do get a little bit more insight when the game is beaten.
(SPOILER)When all the characters are celebrating the Emperor's defeat, many of them vocalize their hopes and plans for the future. Leon however decides to leave because of his past deeds into seclusion, even though his sister begs him to stay. There is a reference that he might return someday when he is ready.
This makes me believe that he wasn't brainwashed and was acting on his own accord. He helped defeat the Emperor, but that alone couldn't wash away his sins.
A story of redemption told with only a handful lines of text.
was all like 
to
who was acctually feeling 
due to the fact that 
:oscar: 
& :frylock: couldn't go to his b'day party. 
patted him on the back and :mog: said there's always next year. 
, 
felt 
, but :moose: (who knows when (as the 
person he is) he came in) was more of a 
. :magus: jumped in and told 
BROKEN 
with :rsl: 
Originally Posted by Twig
