Well I tested a theory last night and I think I can say that Blue is for sure a Male now. I have a pair of normal JD's also, and thought to swap the 2 supposed females and see just how Blue would react with a 6" male JD. Well after putting them together in the 75g tank, I kept finding Blue at the top of the tank, like she wanted nothing to do with it. So I put her in with the known female JD I have and this is the result:
I pulled the female back out, and will need to find a smaller one, or wait until Blue grows some more.