I was in a discussion in the DPS forums about Duality and how it applies to NIN skills when I noticed something odd about Armor Crush and Aeolian Edge's tooltips. Armor Crush has the following line:

Combo Potency: 220 (280 when executed from a target's flank)

Aeolian, though, handles positionals like so:

Combo Potency: 240
Rear Combo Potency: 320

Chaos Thrust, as the only other example I could think of, is written the same way as Aeolian (or more likely vice versa). This makes Crush the odd one out, even though all the information is there.