Finally...

Finally, declared Tabarsi, there is also disagreement in the Isnad or the transmissional chain of the hadith : once Muhammad ibn Khaled reports the tradition from Aban ibn Saleh from Hasan from Anas from the Prophet, and once he reports the tradition from Aban ibn Abi ‘Ayyash (who can be omitted) from Hasan from the Prophet, and this chain of transmission is broken.

Tabarsi finally confirms his position, saying: “The traditions which clearly concern the reappearance of the Mahdi have a more trustworthy chain of narration. In these same traditions, it is reported that the Mahdi is from the Prophet’s progeny. Among them, there is one that Bayhaki’s grandson reports in his work from Abu Ali Rudbary, from Abu Bakr ibn Das, from Abu Dawud Sajestani.....

from the Prophet who said: ‘Even if there remains only one day on the earth, God will prolong it until He will bring forth a pious man from my progeny.’ And in some of these traditions it is reported that the…