When looking at this question you can see discussion about the closure of this question.
Specifically, it quickly got custom flagged as "Duplicate of deleted question by the same user."
In terms of actual site performance, this question is mostly semantics; but I am still curious on the procedure.
Should this be used as a close reason?
The way I see it, because the other question is deleted, we should not vote to close as "Duplicate of deleted". I'd think it would be more reasonable to flag as duplicate of deleted, and vote to close for the direct reason if there is one.
I could not find any discussion on this; so I was just curious on what method would be "more correct" on physics.se.