There are obviously only two options, they have it or they don't. Lets suppose they do have it, then that means this arc is just going to extend even longer since they will have to be defeated multiple times. Now, lets suppose they don't have it, then that contradicts everything Oda has hyped about top level Zoan users, and completely makes the whole subplots completely filler.
Now, having to guess which option Oda will take, I will guess he will take the worse outcome which will be that they do have it but Oda decides to neglect it just like how the Tobbi Roppo had haki but didn't use it.