Board Thread:Questions and Answers/@comment-11005605-20150425070339/@comment-3211055-20150426233939

Yes. If the Z/X doesn't returned at all, the the rest of effects does not resolves.

I think it's pretty much the same as several Diabolus that requires you to destroy your other Z/X to resolve their ability (say, Ira). If the Z/X is not destroyed at all, then it does nothing.