Seu is back to his normal self and of course he resembles Killy.
Did Killy miss or did he intentionally aim at Sanakan? I assume she is dead but who knows, here is a link to a drawing of Sanakan that Nihei did quite some time ago, it orientates on his art style in Knights of Sidonia:
https://twitter.com/#!/tsutomunihei/media/slideshow?url=http%3A%2F%2Ftwitpic.com%2F71nkbe
Ivy is fighting Seu while Maeve is beating the shit out of Killy.