» Click to show Spoiler - click again to hide... «As far as I know, Skrall never had a true "body that used a black Piraka body instead of an Inika one and had a Rahkshi lower back piece as its base." In the leaked pictures, the body design was a piraka body that's computer edited and tilted. Thus, one can assume that this was onlya placeholder and was meant to be redesigned later, just as the launcher was.
I agree with everything else you said.