Here is my case:
I wrote a paper and invited a post-doc to help me edit it. As the post-doc is much better than me, the post-doc changed a lot of content (nearly all, but without changing any idea). According to this contribution, the post-doc stands as second author. The post-doc agreed on the paper, then we submitted and the paper was accepted. After that, the post-doc claimed to be the main contributor, threatened to withdraw the paper (personal-conflict) and really did so. But the editor of the journal refused the withdraw request and asked me for final version. Even so, the second author kept on claiming that I don't have the right to submit the final version. In this case, is it ethical to continue the publication process?