Ann: Further Significant High-grade Au Intersections at Calibre, page-21

I can partly answer 1 of your questions. In regards to the rapid development of Winu, I post the RIO statement below:

The project is a complex greenfields development that challenges the traditional Rio Tinto development model and framework. We aim to do things differently. The project requires a rapid, schedule-driven approach to develop a Minimum Viable Project without precluding the ability for further expansion in future.

How this relates to AZY JV is that in the space of 8 months; 04/20—12/20, RIO decisively commited a budget of almost $27 million for increased further exploration for Y20 & 21. Make no mistake, if the above statement is the way RIO will develop Winu, there's no way that they would spend $27 million on exploration in such a short timeframe, when they could spend that amount towards project & construction costs.
So I believe part of RIO'S rapid development will involve Calibre & possibly Magnum, because the higher grades will pay off the Winu project costs in a short amount of time