hpun
the important thing about the PhD is the research, and not the course work. Therefore, why would it be a big problem if I lost the course work credit, if my objective is to have a good research? BTW, is this a very rare case?
I'm not arguing what's important, you're quite right that it's all about the research, but you still have those 40+ credits or so of coursework, and it's my understanding that the programs like to deal with their own at the dissertation stage.
Of course, for a given program I may be quite mistaken, I can't presume to speak for them all. But I just don't think it's something commonly done or encouraged; different programs can have radically different takes on things, different requirements, types of requirements, etc.
But if anybody knows better than me, feel free to blast apart what I just said, I'm willing to be proven wrong.