Why did the authors John Yahya Muhammad Baptist and his cousin Jesus Isa Ali Christ write the New Testament and Apocrypha during their First Coming and write the Qur'an and Hadith during their Second Coming?

Why did the authors John Yahya Muhammad Baptist and his cousin Jesus Isa Ali Christ write the New Testament and Apocrypha during their First Coming and write the Qur'an and Hadith during their Second Coming?

http://boards.4channel.org/lit/thread/21158450
https://archived.moe/lit/thread/21158450
http://warosu.org/lit/thread/21158450

Politics, to overthrow their Governments perhaps? Idk

https://archive.4plebs.org/pol/thread/401094932
http://boards.4chan.org/pol/thread/401094932
https://archived.moe/pol/thread/401094932

Yahya Muhammad and Isa Ali wanted to establish Government Of Democracy (GOD)?

IN GOD WE TRUST

https://boards.4chan.org/b/thread/887799346
http://thebarchive.com/b/thread/887799346
https://archived.moe/b/thread/887799346

YHWH Allah
(LORD God)