The purpose of the thread is to analyze the differences between Sahabi / companions of the prophet saww and the members of the Ahl albayat in academic manner. Few are outlined below:
1- The members of the Ahl albayat of the prophet saww are covered by the prophet under the cloak / kissa. while no companion / sahabi can come under it
2. The members of Ahl albayat are taken alone by the prophet saww in Mubahila against the Christians and no companion / sahabi can come with th
This is your assumptions but the prophet himself has included the members of purified family ie Ahl albayat upto the last member ie 12 Imam Al-Mahdi. only 4 members were alive in the life of the prophet saww thus you can find 4 members under the cloak / kissa at the revelation of the verse of purification.
The narrations about 12 caliphs / ameers / Imams/ successors from Quresh are present in both sunnis and shia sources. Those 12 names include the first one is Imam Ali and the last ie12