For serious discussion of the controversies, approaches and enigmas surrounding the origins and development of the human species and of human civilization. (NB: for more ‘out there’ posts we point you in the direction of the ‘Paranormal & Supernatural
’ Message Board).
Let's assume the original inspiration for serekh iconography was Sumer. How do you see this actually unfolding. For example, let's say Butis, Tasians or Badaris traded with Urukis, visited each other's settlements etc. The former saw the architecture of Sumerian palaces and aimed to mimick this in their homeland. I presume similar buildings would have been erected by the Nile delta as per your photos. Then, the crest evolved from these foreign and regional symbols, ie Horus cult from Upper Egypt and Delta meets Sumerian palace facade...so the crest is a composite of two cultures.
Presumably, as local architecture evolved, the foreign influence was side-lined.
I can think of an analogous example in Persepolis, where Lydian and Ionian column makers from Greece were "flown in" to help with construction on the Apadana.
Is this the scenario you imagined?