After looking into the matter, Dr. Olle Rodriguez discovered that this was not just one man's idle daydream. Others also advocated similar ideas at that time. Such plans were already in the works from the very beginning of Spain's colonization of the Philippines.
經過深入研究發現，這項侵略中國的計畫並非絕無僅有，當時，也有其他的人提出和桑伽思類似的計畫和想法，也就是說在西班牙對菲律賓進行殖民侵略之初，就已經有這個想法。