Used a rotor, didnt like, it. They ARE heavier than most on the market, you can say they are light as fook but they definitely have a bit of weight on them...
Prophecy, I have owned as well, im not sure how your prophecy didn't fit together ''very well'' as they are made to a fine tolerance and every single one I have seen has worked fine... although maybe you got the bad apple....
To be honest, you've answered your own question already, keep the rotor, don't buy the Z2 if you didn't like the prophecy, the rotor works fine. Clearly. Keep the money and buy paint, neither of the hoppers are going to give you massive advantages over each other.
Hell... im still rocking the Vlocity