Sireh Bin Mora'i and the Death of Khondak

The problem comes people are remembering narratives many years after they happened and piecing together all of the narratives there's two individuals mentioned both of which could not have been alive or present in the story in the same year. Sireh bin Mora'i, he dies right after Khondak who he would not be alive in the sixth year Shabbat impossible because Khondak takes place when? Fifth year Shawal right and he dies one month after that okay so those who say this incident took place 50 or Shabbat everything fits so far so clear correct so far soclear because Shabbat Ramadan Shawal. The other person mentioned is Zayna bin Tijash now