My idea is that a grand battle between Pesmerga and Yuber takes place and Leknaat tries to intervene to avoid the conflict between Stars of Destiny, in the process, Leknaat gets killed and produces a great amount of power that turns both warriors into stone. Windy gets wind of it and considering the responsibility, she tries to renew her actions by forcing herself to replace Leknaat as the guardian of the 108 stars (considering she's really MIA and not dead). While Windy lives, Barbarossa could live as well if he was able to keep the Sovereign Rune intact, he could be accompanying Windy and could be ala Luc in Suikoden II. Not using his great power tho.. but could be if it wouldn't be so powerful as to destroy a whole city.
It is revealed that Viki and Jeane is a result of a cloning experiment using a master Cloning Rune that was revealed by Windy which she doesn't know what happened. Viki on the process, unconsciously produces multiple Time warping dimensions as she holds the True Blinking Rune that causes the successfully cloned Jeanes to exists on multiple timelines having the same appearance and age. Viki on the other hand produces only a single clone who doesn't remember anything (thus, producing a clumsy one while bearing a Blinking Rune as well which could be a copy of a True Rune or not) as her rune seemed to hinder the cloning process. The real Viki had a little sister who is also named Viki (Suikoden III) who was told by the Real Viki to keep an eye out on the clumsy one as she could be a great threat if her real power is unlocked. This was not an easy task as the small Viki only catches up on the cloned Viki in Suikoden III. Later on, it is revealed that the Real Viki is Leknaat herself and that her death could have produced great collapse within the whole planet.
What do you guys think? I think there could also be a way to bring back Leknaat to live by finding a True Resurrecting Rune.