I’m going to try to answer you from the way I read it and I do think Blizzard should explain this a bit better but I do want to say that people do not come here just to help you so you are not entitled to it. We aren’t Blizzard customer support. I’ve tried to help you before and you frankly didn’t even seem to care that I spent any of my time doing so.
The blue post does say you can earn a maximum of 4 ranks which means that if you’re rank 0 you can only get to rank 4 so yes there is no point the first week in farming out the full 500k of the last bracket. Which is actually just as it has always been.
I’m not a huge fan of spreadsheet math or theorycrafting. The only thing I’d take issue with about what Dragonballz said is in showing that the max rank for week 1 is 3 when it should be 4 based on Blizzards blue post:
If you farm out 100k in week 1 you should be safe to get from R0 to R4 which as per that post is the max. That actually seems to be only 31k required but I’m being safe.
Maybe Blizzard will break it down better for you or a new calculator will be put up that makes things easy, or another poster will come alone who wants to help you, but maybe not.