Thinking a bit more on the consolidation I thought of a way that Nin could work with combo consolidation, but it would require just a bit of homogenization with drg. Using drg as the example, drg has two combos the Full Thrust combo (that I will refer to as the "damage combo") and the Chaos Thrust combo (that I will refer to as the "debuff combo").

To consolidate, they'd have to make Aeolian Edge the "damage combo" and then turn Shadow Fang -> Dancing Edge -> Armor Crush in to the "Debuff Combo" and then work from there. It would be similar to drg, but drg would still be the "fourth combo attack" melee job.