When it was made known to me that some suspected Zhou, my recommendation was to confront him privately for his explanation.
Would have been nice to keep me in the loop at that point, then.
Zhou's explanation sounds convincing, but as previously said it is not up to us to judge, and legal action is most likely unavoidable at this point.
Either way, I believe many here would appreciate to know who they can turn themselves to to get things moving forward.