Does ISIS Have Their Mahdi?

A reader directed my attention to this alert from The Threat Journal indicating that ISIS had already selected a new leader. From the alert:

The terror group has also named Abu Ibrahim Al-Hashimi Al-Qurashi as the new "caliph" and "emir of the believers." The name Qurayshi suggests the new leader, like Baghdadi, claims a lineage to Muhammad's tribe of Quraysh. Little else is known about this individual outside of ISIS circles.

Of course, ISIS threatens revenge on the United States in a video. The Threat Journal notes the following key passage from the video:

"Do not rejoice so much, America

The person who will punish you has come

You will feel that Baghdadi's days were a blessing."

The reason that the claim of lineage is important is because the Muslim's "messiah," or Mahdi, is reported in various hadiths to be of the lineage of Mohammad, with some even stating that the Mahdi will be a direct descendant of Mohammad through his daughter, Fatimah. Like most religions when it comes to eschatology, there is considerable debate among Muslim theologians about the nature of the Mahdi, or even if he is supposed to be real person. But the arguments of theologians are of less importance than what is believed by the rank-and-file, and what I've read suggests that most Muslims believe that the Mahdi will be a real figure that will come to lead Islam to victory over other faiths.

    One of the interesting points is that Mohammad is said to have stated about the Mahdi: "His name will be my name, and his father's name my father's name." Mohammad's father's full name was:

ʿAbdullāh ibn ʿAbd al-Muṭṭalib ibn Hāshim ('Amr) ibn Abd Manāf (al-Mughīra) ibn Qusayy (Zayd) ibn Kilāb ibn Murra ibn Ka`b ibn Sûf^iyāń ibn Lu'ayy ibn Ghālib ibn Fahr (Quraysh) ibn Mālik ibn an-Naḑr (Qays) ibn Kinānah ibn Khuzaymah ibn Mudrikah ('Āmir) ibn Ilyās ibn Muḑar ibn Nizār ibn Ma'ād ibn 'Adnān

Obviously "Abu Ibrahim Al-Hashimi Al-Qurashi" does not incorporate Mohammad, nor does it seem to match up with Mohammad's father. But little is known about the new ISIS leader. Wikipedia states:

Al-Hashimi's name is believed to be a nom de guerre and his real name is unknown. There is some speculation that al-Hashimi is Amir Muhammad Sa’id Abdal Rahman al-Mawla, who is also known as Hajji 'Abdallah.

 If the latter speculation is correct, then Al-Hashimi's name would meet the criteria of either being named after Mohammad or bearing the same name as Mohammad's father.