Gusev basically realises that Kira is the real traitor, yet still assists her/stops the twin? And the only distraction from this is that the twins possibly swapped?
Honestly, given that the swap is so far on the past (i.e. Jung Woo/no one in the present thinks she's someone else, they only think she's named something else), it doesn't do much for me, beyond hint at her secret from JW.
@Peter_5 we still don't know who's stronger. Lillia was already injured when they started fighting. They also both get 'more fearsome' when emotional....