The sequence has three distinct stages. First, remembered episodes involving Ḥujr, al-Jawn, Imruʾ al-Qays and al-Mundhir are used to show earlier services. Second, kinship through ʿAmr ibn Umm Unās is offered as a ground for sincere counsel. Third, the covenant of Dhū al-Majāz is invoked to insist on recorded commitments.
The persuasive movement is we served → we are connected → we are bound by an agreement. The literary function of each claim can be analysed without treating every remembered episode as already proven history.