How did Guru Nanak Dev Ji disappear from beneath the cloth that was placed over him after his death?

This is Sikh mythology , fable , story and fiction. I assert this because of 4main reasons...
1}When you read the GuruGranthSahib , you can tell that in all pure honesty GuruNanakDevJi , conveys his role as a humble witness of Gods miracles , he does not see himself as the actuator of divine natures , upon that premise we can deduce that such a feat would not be something that he would consciously desire , for it was not in his character.
2}Disappearance of the dead body , before burial-cremation-entombment , is nothing new , its an ancient fable told all over the world , from early Greek mythology , pharaonic Egyptian mythology , some have even said it is why Jesus Christ was said to have disappeared and resurrected , because it was a part of the regional folklore that astounded people.
3}Such a miracle , "IF" it had occurred would be on the same level as a "Death of God" {which is an altogether different science to itself , that God incarnates amongst mortals , lives as they do , and then experiences death as how mortals do , the exception is , that he is a God , ergo the fantastical miracle , of no human mortal remains} Now if that was the case , then it would be blasphemy against Sikhism , Sikh Gurus like Guru Gobind Singh , was revolted by the idea , that some would claim him to be God , that he said , who so ever calls the Sikh Gurus God , will burn in hell. . .
4} I conclude , it was nothing more than a ploy to heighten Sikh mythology , to give GuruNanakDev a "supernatural divine" quality , in a world where simple folk , would worship stones , trees , and believe in witchcraft , primitive folk would then unfortunately look to idolise & worship GuruNanakDev , instead of understanding the AkalPurakh {the SK name for God} that GuruNankDev had tried so very hard in his life , to get people to understand a timeless , formless , being