I was dumbfounded myself at the notion of instantaneous light when I first encountered the Punctual Field Theory, propounded by a retired physicist/researcher here in Seattle named Robert Archer Smith in a manuscript entitled "The Truth About Light" , circa 1980. This was never published, and after personally meeting with Bob over several years, he disappeared from sight, perhaps deceased?, and his unpublished book with him. Someone out there knows him and or has his book in hand... Meanwhile, I have come to view light as a force, not particle nor wave, arising from the centropic unified field, in the same manner as gravity, voltage, nuclear force, etc. Viewed in this manner, it becomes quite clear why relativity misses the mark, and why optical geometry becomes the ultimate explanatory tool for light.
I've learned much about the electrical connectivity of space here at EU, and from dialoguing with Ralph Sansbury, have a clear reference point for localized light "delay" phenomenal as "c". Everywhere I go I look and see light vectors and spectral phenomena as manifestations of unified field pressure gradients. Bob Smith's work primarily but not exclusively involved slit apparati, and there are quite simple demonstrations of the non-wave/non-particality of light. I have yet much to learn from EU and can't help but think I have something to offer these very creative and imaginative folk.
Truth extends beyond the border of self-limiting science. Free discourse among opposing viewpoints draws the open-minded away from the darkness of inevitable bias and nearer to the light of universal reality.