Why were the Ten specifically mentioned, as opposed to the rest of those given glad tidings of Paradise?

Many Companions, both men and women, were given glad tidings of Paradise. However, the ten who were given glad tidings were mentioned in a single hadith, and they are: Abu Bakr, Umar, Uthman, Ali, Talha, Al-Zubayr, Abd al-Rahman ibn Awf, Sa'd ibn Abi Waqqas, Sa'id ibn Zayd, and Abu Ubaidah ibn al-Jarrah, as narrated in the hadith of Al-Tirmidhi and others.