AA owes its content to numerous upstream sources, mostly medical and religious.
It's interesting to know about these, but there is a risk of assuming that everything that lay upstream of AA can legitimately be brought into the AA programme to supplement it, as though such ideas are the secret, esoteric, and higher-grade truths that we should graduate onto after reading the Big Book.
AA did select ideas from predecessor movements, including the Oxford Group, Christian Science, Unity, and New Thought. But it also rejected as much as it selected, even from these movements.
No 'four absolutes' for AA; praying only for knowledge of God's will; God as we understand God; and other restrictions and boundaries.
Of course, individual AA members will read and use such materials, amongst other religious and spiritual materials that have nothing to do with AA at all, in exercise of their own spiritual liberty, but one should be cautious about taking ideas from the predecessor movements and automatically slapping the AA label on them.
Emmet Fox is a good example. Yes, he was used by early AAs, but many of his ideas do not make it into the Big Book. For instance, there is no insistence in AA that we are entitled to material prosperity and should employ spiritual means to achieve it; there is no suggestion in AA that we are to pray for others and pray to bring about the outcomes we think best, in our circumstances or in the lives of others. Rather, we are extremely limited, to praying only for knowledge of God's will for us and the power to carry that out. Emmet Fox suggests not accepting anything less than harmony of our circumstances and that we are the ones who bring about all of the circumstances in our lives (either through our actions in this life or in a previous life), even, collectively, the weather; the AA philosophy is about adjustment to reality and fitting ourselves to be of maximum service to God. There are numerous other examples of ideas contained in the predecessor movements that did not find their way into AA.
AA is AA, and other movements are other movements. I do not mix the two. The Big Book gives a hint about the relationship when it suggests on page 87 that the set prayers we choose are those that emphasize AA principles. In other words, the principles set out in the Big Book are primary, and ideas from outside are great, as long as they merely support those ideas, not changing them, overturning them, or adding to them.
This keeps the strict AA message carrying to the strict message of AA.