Please disregard any grouping or order you think my butterfly chart has. A chart not a navigation mock-up or anything like that. It is a screen from a project file that just has all the nav links with no specific order. The only meaningful piece of data from that chart is the different color groups showing different functionality.
Also let me reiterate this point again, I am not changing the layout of PM. I have said this before while explaining my design goals. The menu looks the same as it does now style, positioning and all that.
Just because PM is customizable does not mean that breaking normal main navigation ideas by changing it is a good default position to take. The path of least surprise, least visible moving parts is best for the bulk of end users on the internet as a whole. As people use the internet they develop habits and expect things to work a certain across all the sites they use. They don't think about different designs, or aesthetics it is about how fast can I get my task done. Little cognitive breaks like that hurt usability. I can see changing secondary navigation menus based on logged in status but PM does not have anything like that above the fold.