Awareness in the dream is necessary for the reality check to work.
When I am in a vivid dream very aware I feel lost and start to wonder what is going on, but since I have a habit to do a reality check when I get that strange thought, I do the reality check to see if I am dreaming. Awareness -> Reality Check -> Lucidity. So I understand what you mean when you say that one is lucid before one do the reality check, but remember that one can be aware in a dream without realizing that one is dreaming. So the reality check is just as it's name suggest a check of your reality, but of course you need to suspect the reality first 
An easy example: Imagine that you were dreaming right now! You are still aware of yourself and your reality, but you are not aware of the fact that you are dreaming.
But it is possible of course to become lucid within the dream without doing a reality check, sometimes the "feeling" of dreaming itself makes me lucid.
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