I really hope not. Chigara has her fans and it seems almost mean spirited to have her replaced by a clone. Sister? Sister clone? Personally I'd be fine with tossing Chigara in the trash bin but for her fans sake I'd want her to come back.
Is Lynn maybe around to provide a body for Chigara to download into? That would suck for Lynn. Maybe it's going to be a big choice that comes up in the future?
So is Lynn going to be some kind of Chigara replacement to fill in the Chigara hole in the cast or is she going to be her own character with Chigara still existing alongside her as a potential waifu?