He'll get 500 points much easier than the winner of Dubai 500, where will probably be 6 to 8 top 10 players, thus there would be four top 10 at maximum in Acapulco.
Ferrer must do a favour to the rest of Big Four and allow Rafa to vulture only 300 points. Or clay GOAT Isner should also play Acapulco, he could meet Rafa in semi, and let the Vulture get only 200 points.
He shouldn't have a problem fulfilling the 500 requirement with this. 3 tournaments on clay out of 4 just shows how clay reliant he is. Unless he opts to skip Barcelona although Madrid would be a better choice.
Imagine how many more tournaments would have Fed won if at peak years played those MM tournaments. At those years he would have won Acapulco playing with left hand, double handed BH and serving under the arm