I don't mean to bring up the old post but I found it very interesting. I'm wondering how the hell are they creating clones of the Heroes? Maybe that bad ending where you have the oversized dick and they make the MC cum into those jars?
That's a very sound version. But I think it might be more of a mold, from which both the regular castle staff and the heroes were made of, depending on the input.
Since even back in Attack it devil Legion! you were able to customise your wolf brigade with different skin and hair colors suggesting the somewhat of a genetic variation in succubi, but in the castle, the regular enemies (minus the dolls and machine girls, since they obviosuly could be just mass produced and assembled) look identical.
Also, the Mother Chapel having the higher level succubus and being a quasi religic cult also had a different looking succubus even, when they're the same enemy type (like the ones walking in trio and the nuns throughout the not inverted version having different appearances).
Most likely, I'm just stretching it a bit to far, since it looks like the regular succubi appear to be the running gag of the typical super villian goon corps - in the ending of Attack it Devil Legion, the ones that appear on the ending screen look completely the same, and customisation might just be a cool little addon, but its interesting to consider some variants.
*** and well obviously the simplification of the game design and development process took at toll as well ***