Anyway,
from what we're shown, I can at least make an assumption of how the comebackers would play...
Vice - Crutch? Arm in a cast? Since when did that stop anime characters from making a comeback?
I expect him to maybe snipe a Number who's after Teana.
Zafira - Human form would be nice. He should at least show his worth in defense. The likely scenario where he can is rather numerous.
Acous - The
esperinvestigator just disappeared!
WHat happened with all those hints of him being around the Aces' level during the manga?
Chrono - The fleet seems to be too slow.
I hope they at least show him fighting in the field.