How To Be Sure That Ijma Aur Tawatur Of Sahaba Actually Reached Faroff Lands
Yemen is the part of Arabia not some far off isolated place. If a single companion transmit something he knows and learn from Ijma, it is the same tradition he is transmitting, however, it becomes mutawatar for the people who receive it witness in the community and the people of Yemen did witness. There is not incident in the history, where a single or a few companions taught Islam. They were sent to invite people to Islam but what they taught was a collective tradition, which they initially taught them and then they witness it in the community.