He gets an equal increase to his damage from Aim and Cunning; as in: each point in Cunning will give him 0.20 DPS and each point in Aim will give him 0.20 DPS.

**However**, in an ideal situation you would use both stats. This, because a main stat also gives additional crit chance, however this is on a diminishing return scale. What this means: 700 Aim + 700 Cunning = same amount of raw DPS, but more crit chance, than 1400 Aim and 0 Cunning, for instance. Try to balance out both stats for maximal returns.

Great post, my compliments.