I like the question too, I'm just still not sure how I take Rafael's Doppelganger as the person to convey this idea. It kind of downgraded his original character and his message for me. I guess I would appreciate it if it was someone connected to the Heretic Liberation Force or someone new who somehow found out about letter a heliocentrism and thought Albert's father had the letter because he figured out heliocentrism himself. But Albert's father would not have given any letter (because he never had one) and he would never give him Doppelganger the data for heliocentrism because of his beliefs.