Disagreements do not necessarily lead to divisions or crises. The real question is why the Anglican Church has not been able to contain the disagreements, and why they are causing the church to tear itself apart.
The current crisis is not, in other words, doctrinal; it is ecclesiological. As the center of Anglicanism has moved away from the Church of England to the global communion, the glue that has held the Church of England together has been exposed as inadequate for binding the Anglican Churches worldwide.
It seems to me that this is the question still to be answered by this Lambeth Conference.