AQ Diamond USB Cable with Ayre QB-9 DSD?

Would a 2.5' AudioQuest Diamond USB cable add any sonic value connecting a Senore ultraRendu roon endpoint to an Ayre QB-9 DSD DAC, or does the optical coupling of the DAC obviate that value?  I'm using an 18" Cardas USB cable now.
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There is only one way to find out.  Music Direct has a 30 day return policy so you can try it out without risk.

I recently added this cable between my Mac Mini and my QB-9 DSD and the improvements were incredible in my opinion.
Given that you are also using a QB-9 DSD, I think your reply tells me what I wanted to know.  Thanks.