Any human made tradition from Hadeeth or Sira is not a part of the religion of Islam. As a human made tradition we deal with it in the light of the Quran. If it contradicts the Quran we refuse it as a human made tradition contradicts Islam. If not, we accept it as a human made tradition belongs to the Muslims not to the religion of Islam. In every case , the sira has nothing to do with Al Motawater at all. It is just stories copied from one to another with some details here and there , and all of them were written centuries after the death of the Prophet Mohamed.