Which question? I think that some of your questions were rhetorical. If the question is do I think that they can totally balance the game before DIV is released, the answer is no. If the queston is to whether they can balance the top clears of non-seasonal GR clears on a per class basis to 5 GRs from worse to best, my answer is yes.
Look at the data for yourself:
They could even get their next patch. You bring down crusaders and raise DH & necromancers so that the median of the top 10 GR clears are 143-139.