Mufti Muhammad Sadiq was an inside man working for MGA. In 1926, he published a controversial book on the life and times of his master, MGA, this seems to be the first edition, the second edition was published later, the original is obviously missing. In this book, he officially changed the year of birth of MGA to 1835. He also told how MGA also frequented “opera-houses” and etc in British India. MGA was even shown as willing to favor rich people over poor people. Mufti Muhammad even lied about the conversion of Mr. Wragge to Ahmadiyya, which never happened. MGA would give Mufti Muhammad Sadiq drugs without explaining what was in them. This book is also spelled as Dhikr-e-Habib in the 2009 online edition of Tadhkirah. This book also mentions his correspondence with Alexander Russel Webb. The Al-Hakam team translated pages 1-31 online, check it out herein.
The first edition of Zikr-e-Habib(1926), free download——Zikar E Habib.