Is following the Sunnah of the Prophet (peace and blessings be upon him) inclusive of following the Sunnah of the Rightly Guided Caliphs and all the Companions, or not?

The Shaykh : It may occur to some minds limited in knowledge that the intended meaning of the Sunnah is: the Sunnah of the Messenger (peace and blessings be upon him) only. It is undoubtedly his Sunnah, but not only his; rather, as you heard from the hadith of al-'Arba' ibn Sari'ah, where he also commanded holding fast to the Sunnah of the Rightly Guided Caliphs. So, from his Sunnah (peace and blessings be upon him) is the Sunnah of the Rightly Guided Caliphs. And not only that, but there is another expansion of the Sunnah of the Prophet (peace and blessings be upon him and his family), where he included in it the Sunnah of all his Companions, because they were upon guidance from their Lord. This is what came in the hadith of: The Saved Sect. This hadith came through many routes, with similar wordings, the most famous of which is his saying (peace and blessings be upon him): . All these sects, which number seventy-three, the Messenger of Allah (peace and blessings be upon him and his family) rules justly over all of them that they are in the Fire, except one of them. This is a very important matter because it means that one out of seventy-three is the saved sect, and seventy-two sects are among the perishing sects that deserve to enter the Fire. Therefore, this report from the Prophet (peace and blessings be upon him and his family) was a report that motivated and drove his Companions to ask him—and they had the right to do so—what is this saved sect? So that a Muslim might try to be among it. They said, "Who is it, O Messenger of Allah?" He said: . So here we understand an expansion of the Sunnah of the Prophet (peace and blessings be upon him and his family), another expansion. The first expansion: the Rightly Guided Caliphs. The other expansion: the guided Companions of the Messenger (peace and blessings be upon him), where he said: .