My point is that the importance of The Prophet Mohjammed’s family from whom The Mahdi descends had been overidden by the system of khilaafat for which Abu Bakr was the first in taking up it’s seat.
The Last battle orders of Mohammed, two days before he died, was to send the The Sahabah, inclusive of Abu Bakr and Umar, with the the Young Usama, to the edges of the empire to wage Jihad against the Romans.
That is where they should have been. But they waited until The Prophet died and went afterwards.
Why?