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
The first group of emigrants to Abyssinia had come back to Makkah after hearing a rumour that the Quraysh had accepted Islam. The rumour proved false, and the persecution of the Muslims went on as before. Meanwhile, news spread among the Muslims of the safety and freedom they had found in Abyssinia. So more than 80 Muslims set out for Abyssinia a second time. They were perhaps 40 to 50 percent of all the Muslims, and more than a tenth of Makkah's whole population. They were led by Ja'far ibn Abi Talib RA, a first cousin of the Prophet ﷺ. Uthman ibn Affan RA, who had gone the first time, stayed in Makkah and later emigrated to Madinah instead. Mus'ab ibn Umayr RA had also gone the first time, and he too did not return to Abyssinia.
This second wave was so large, perhaps the bulk of the early Muslim community, that it might never have happened if the first group had not come back to Makkah and spread the news of Abyssinia 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.