Ja'far ibn Abi Talib RADramatizedWording is illustrative; that Ja'far RA led this second group is attested.
Life event · Second emigration to Abyssinia
Led more than 80 Muslims in a second emigration to Abyssinia.
~Shortly after the return of the first emigrants · 6 BH
After the failed rumor-driven return, and as persecution continued unabated, news of the safety and hospitality of Abyssinia spread among the Muslims. More than 80 Muslims (a huge proportion of Makkah's population) emigrated a second time, headed by Ja'far ibn Abi Talib RA, a direct cousin of the Prophet ﷺ. Uthman ibn Affan RA chose to remain in Makkah (later emigrating to Madinah instead), and Mus'ab ibn Umayr RA, who had gone the first time, also did not return to Abyssinia.
The scale of this second wave, perhaps the bulk of the early Muslim community, meant it may not have been possible had the first group not returned to Makkah first.
From Abyssinia to the Boycott·Chapter 4 of 8The second emigration
See the whole storyOther events recorded in 6 BH. Their order within the year is not established; use the storyline above for the sequence.
Led more than 80 Muslims in a second emigration to Abyssinia.
Remained in Makkah rather than returning to Abyssinia; later emigrated to Madinah instead.
Did not return to Abyssinia a second time, having already emigrated there the first time.