Even the disbelievers of Quraish knew that the top of the Muslims are the Messenger and his two ministers (Abu Bakr and Umar)

Bukhari narrated the story of the battle of Uhud when the Muslims suffered seventy casualties (losses).

Abu Sufyan ascended to a high place and said thrice, “Is Muhammad present amongst the people?” The Prophet (ﷺ) said, “Do not answer him.” Then Abu Sufyan said thrice “Is the son of Abu Quhafa (ie Abu Bakr) present among the people?” The Prophet (ﷺ) said, “Do not answer him.” Then Abu Sufyan said thrice, “Is the son of Al-Khattab amongst the people?” He then returned to his companions and said, “As for these (men), they have been killed.” `Umar could not control himself and said (to Abu Sufyan), “You told a lie, by Allah! O enemy of Allah! All those you have mentioned are alive, and the thing which will make you unhappy is still there.”
Shaihkul Islam Ibn Taymiyyah rahimahullah said:

This is the chief of the disbelievers at that time (because later on he accepted Islam) asked only about the prophet sallallahu alayhee wa sallam, Abu Bakr and Umar and not others (ie from the Sahaba) because he knows that they are the heads of the Muslims: The Prophet and his two ministers.

Majmoo’ Al Fatawaa 4/402