 Had the narrator vehemently denied his position as Yandro, would the opinions of the people have likely changed?
He was Yandro, the Stranger of the Prophecy—and he found that he was destined to fight both sides. It is as well, for this will be a birth and beginning of your destined leadership on Dondromogon." The voice was telling me that I had been snatched from worlds away, for a specified purpose here on whatever windswept planet Dondromogon might be. Of course, such areas, between the hot and cold hemispheres, would be buffeted by mighty gales ... Dondromogon was found and settled long ago, by adventurers from afar. Especially as I don't know who I am, or where I'm from, or anything that has happened longer ago than just a moment.
 No, because the inhabitants strictly uphold and respect the prophecy that named the narrator as Yandro.
 No, because the narrator would eventually be forced against his own will to be Yandro.  Yes, because the narrator would have been sent back to Earth for his denial of the position.  Yes, because the inhabitants would have instead acted distastefully towards the narrator for not wanting to assume the position.  No, because the inhabitants strictly uphold and respect the prophecy that named the narrator as Yandro.