Lol the preview for 11 hinted at exactly what I expected. I figured after losing Ein Zwei would need something like a cheerful positive genki gir type person in order to re-regain his humanity (Like Saya for Train in Black Cat). I didn't expect him to go back to Inferno though, but perhaps they found him, stitched him up, and Clau rebrainwashed him some while he was hurt.

In any case, it seems Ein is really gone and that's about the worst thing that could possibly happen in this show. Still Ms. McCunnen still interests me and I want to see more of Zwei's jouney so I will persevere despite the tragic loss.