It seems pretty straightforward to me. In a recapitulative reading of the first two pericopes, there is at least a hint that there was an “adam” (pl., “groundlings”) that preceded “imago Dei humanity” in the transition noted going from Genesis 1:26 to 1:27. In a sequential reading, “humans outside the garden” are the very “imago Dei humanity” being described in the first story, at the conclusion of which we begin the second story about Adam and Eve. So, no matter which view you take, you have to account for the fact that there’s someone suitable enough for Cain to take as a wife, who he’s capable of breeding successfully with, who is NOT from his family lineage, as God has expressly exiled him from them. The elements are all there for discovery.
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