With respect to Daniel 2, Babylon was the head of gold, and the Persian empire was the breast of silver. According to Daniel 2:35, the head of gold, the breast of silver, the thighs of bronze (Greece), the legs of iron (Rome), and the iron and clay, would all be crushed all at the same time. The crushing of Babylon, was just part of Daniel 2, whereas they were all crushed singularly, ending with the crushing of the iron (Rome) and clay (Ottomans) at the battle of Megiddo, in 1918, and 50 years later at the Israeli war, with the crushing of the iron (Russians), and the Muslims, in the Israeli war which was a fulfillment of Zechariah 12. Your Preterist doctrine is behind the times by about 2000 years. By the way, the assumed author of the partial Preterist doctrine was a Roman Catholic Jesuit around the time of Luther, and supposedly used to counter the Reformation. Persia/Iran/Elam, seems to be waiting to be crushed at this time (Jeremiah 49:35).