With regard to sayings I don't think there's much confusing them with narratives - aside from the fact there's a spectrum rather than a clear divide. Either a collection of sayings or a largely narrative account can be called a Gospel
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But think about this a bit more deeply. Why don't we have a similar rich body of early copies and written references for the gnostic writings? I can see only two explanations; either these gnostic writings had not been written yet, or they were not generally accepted.
Why must we speculate about Luke's sources? Why are the documents represented by the Egerton and Oxyrynchus 1224 fragments otherwise unknown?
We don't have much from the 1st or 2nd centuries from either the Gnostic or the orthodox camps in terms of actual manuscripts, and we can be sure that many documents have been completely lost and forgotten.