Theology versus theodicy
From Monism to Dualism and God Shiva
For the first 20 years, the Brahma Kumaris were a monist tradition in the form of orthodox Advaita schools believing that there was only one ultimate substance or principle called the Brahm or Braham. They practised faith in "Aham Brahm Asmi", literally "I am Brahman" or "I am God".
At some point after 1950, the Brahma Kumaris introduced an individual personality they called the "Supreme Soul", WITHIN that Brahm element or "Soul World", into their theodicy calling him "Shiva Baba".
This should be 'theology'.
I think also helpful in 'BK for Dummies' would be a basic chronology (don't know if this is already on the site somewhere) showing (approximate) dates for maybe the ten most significant events in BK history, e.g. birth of Lekhraj Kirpalani, first visions, first Murli, first Murli that survives today, death of Lekhraj Kirpalani, arrival of BK in the West, emergence of PBK etc.