I have more faith in Zenos as a potential villain if Ishikawa continues to helm the writing department. She has a fairly deft hand with character writing and while I don't think Zenos as a character can be entirely /fixed/ given that he started as little more than a force of nature more than an actual character, if anyone would salvage him enough to be at least tolerable it's her. My only worry is who is writing Zenos' character going forward... If it's not Ishikawa I don't have a lot of hope that he'll get any true amount of depth. Which is fine for most other stories but to precede and follow a villain like Emet Selch just makes Zenos all the more wanting as an antagonist.