There's nothing wrong with writing up your answer that solves your *exact* problem by deriving from other answers. 

You should make it clear in your answer that AZ's information was important to your success. This will credit his work and is a tip for those of us voting that you guys solved this together as a team and will encourage us to vote you both up. So I would just mark yours as the answer and then give the guy an upvote.

Here's an example of how I did it when I ran into this:

https://askubuntu.com/questions/4572/how-can-i-cache-nfs-shares-on-a-local-disk

(Note that you should edit your question to include a link so that we can vote on it as well!)