I didn't get a chance to read the whole post cause I was out of town this weekend when i saw it (in a hotel) and was just skimming, but it looks like GC is concerned that the killing machine change may not have been enough to lower DW's damage.
(i'm going to make a guess here its because 5 PPM is only based on each weapon's damage, and w/2 weapons it becomes 10 PPM similar to maelstrom weapon). I'll post again when I see it.