Even though a question may be closed by receiving 5 close votes, the votes do not necessarily need to agree. I think this is a good behavior, but recently I voted to close a question for being an exact duplicate (which it was) and found the question was closed as "not a real question".
This is unfortunate, while I'm happy to display my username and acknowledge that I voted to close, I'd like some additional transparency. That is, if it was a 4-1 vote for "not a real question" vs "exact duplicate" I'd be interested in seeing that level of information.
The point is to be transparent about why the question was closed, and though 5 users may agree the question needs to be closed they may not agree why. It's important to recognize all the reasons for closure, not just the majority reason.
I'd suggest displaying this information as something like:
closed on Jun 21 at 4:26 as:
- not a real question by foo, bar, baz
- exact duplicate by alice, bob
Once a question has been closed I'd argue it's more important to understand the rationale than it is to worry about an extra 2 lines of text. If the votes are 2,1,1,1 perhaps keep just 2 bullets, the first showing the majority vote, the second saying "for other reasons" as a summary of the change. The point is to aggregate the summary by reason.