I have researched the split in the Ahmadiyya movement very closely…somehow, Mahmud Ahmad and Muhammad Ali purposely avoided talking about Chiragh Din of Jammu (Jamooni) and his claim of prophethood which caused MGA to ex-communicate him and to organize a boycott against him.
What’s really interesting here is that MGA had just claimed prophethood in Nov 1901, with the publishing of his announcement, “Eik Ghalti Ka Izala”. Amrohi had even written a letter to some people who didn’t quite understand this “change in belief” that MGA had just done, his letter can be found here: https://ahmadiyyafactcheckblog.wordpress.com/2016/09/30/maulvi-abdul-kareem-claims-prophethood-per-mga-maulvi-amrohi-disagrees/, and additional essay can be found here: http://www.aaiil.org/text/books/mga/correctionerrorekghaltikaizala/importantdocumentscorrectionerror.shtml
Chiragh deen of jammu claimed prophethood and mirza boycotted charagh deen (ref: rphani khazain, vol 18 page.242). MGA published an ad in rohani khazain about charagh deen jamu to inform everyone that he is no more in his community or in jamaat e ahmdiya. (ref: rohani khazain vol 18. page 239). Chiragh Deen doesnt seem to show up in any additional ahmadi sources…..stay tuned for more on this.