Okay, I don't get it. Do you consider part of the definition of a running joke "never to be resolved"?
It is absolutely true that Sabine's being an ambiguous fiend was a running gag for a long time. It is equally true that one of the archfiends she works for stated that she is a succubus in 637 and that ever since then everyone in the comic has treated her as an unambiguous succubus.
There is ambiguity about Zz'dtri's gender?just as the plentiful references to Z as either male or female have yet to resolve that conundrum.
...There are references to Zz'dtri as female?
Glad to see you're no longer claiming she has a good statistical chance.I'll be happy to await the following comic to see if Sabine saves vs. the banishment. When it comes to story, even a 1% chance which occurs can be just a part of the plot.