Intro
I have written about this topic before.  See here: https://ahmadiyyafactcheckblog.com/2017/03/28/master-fard-muhammad-was-a-lahori-ahmadi/

And here: https://ahmadiyyafactcheckblog.com/2017/03/31/elijah-muhammad-read-ahmadiyya-books-and-formulated-his-teachings/