Ok so a thought here, when Wanda gave birth to baby Joey, they said something about "this one" surviving. So ....um maybe something JJ is doing or weird Doctor dude is doing is connected to Wanda's fertility???
There's a discussion on FB about maybe JJ implanting eggs he stole from Wanda and implanting them into Adaleen and Nikki to create the "Super Walker Race"
And when Wanda said "You promised" when he said Adaleen was pregnant.
But the rest of your theory makes sense, because of the very first comment JJ made to wanda during their first encounter after she came back from Mexico with joey, about him having something precious of hers. Back then I was thinking virginity, but now, it seems even more sinister.
And the theory another PP had about JJ being excommunicated also makes sense, since he doesnt seem to care that Joey murdered Roman, just wanted to use it as leverage.