If you can’t see a difference in your chainline without breaking out the callipers to measure it, then there’s really no chance that your chainline is the issue. Dura ace cogs are designed for racing. The tooth shape/profile, is designed for strength and positive engagement under heavy torque load. Some cogs are designed with smoother, rounder teeth profiles. My guess is this what’s causing the noise you’re hearing and I would guess it will get quieter over time. From what I can see in the photo, the teeth look fine. But if you’re asking if it’s worn, am I to assume you bought a used cog?