Rubuta ci gaba ga wannan sakin layi - Ba a bayyane a cikin kafofin musulmi na tsakiyar lokacin da Muhanna ya mutu ko lokacin da aka cire mukamin "amir al-ʿarab" daga gare shi. An san tabbas cewa kafin mamluk mamayar Siriya a 1260, "amir al-ʿarab" shi ne kawun Muhanna Ali ibn Haditha. Yanayin da Isa ya maye gurbin Ali ba shi da tabbas. A wasu juzu'i, Sultan Qutuz ne ya nada Isa a matsayin lada ga goyon bayansa a yakin Ain Jalut
a kan Mongols a ƙarshen rabin 1260, kodayake kafofin sun nuna cewa Isa da mahayan dawakai na Bedouin sun guji shiga cikin yaƙin. A cikin wani sigar, magajin Qutuz Baybars ya nada Isa a matsayin lada don taimaka masa a lokacin da yake gudun hijira a Siriya a cikin 1250s (a cikin wannan sigar, an cire Ali daga taken a matsayin horo don hana Baybars mafaka). A kowane hali, an san cewa Baybars ya ba da takardar shaidar tabbatar da Isa a matsayin "amir al-ʿarab" da kuma amincewa da "iqtaʿat" (fiefs) a cikin 1260/61. Daga cikin "iqta'at" sun hada da rabin Salamiyah, wanda aka raba shi da "iqtaʿ" na Hama, da Sarmin. Baybars kuma ya amince da Al Fadl da sauran kabilun Beduin na hamada da kuma tsaunin Siriya tare da tsaron iyakar Siriya tare da Mongol Ilkhanid-da ke Iraki.