There was no photo shop back then !
Your article on the development of shape leaves out the one and ONLY reason that the shape has 'evolved' and that is the appalling effect of the Martin Brothers on the breed when they ran the SV. It is an absolute truth, which you can see by looking at photos of Siegers before and after their reign that they were instrumental in changing the breed shape. And the simple fact, again a matter of record, is that they did so for their own profit. There is NO evidence of any type that suggests that the loin/back should be 'hinged' and, as you correctly point out von Stephanitz regarded that as a fault. From a bio-mechanic point of view it does nothing, at all, to improve a trotting gait. So, it wasn't 'evolution' that has changed the shape - it was greed and 'fashion', in that, as with all dog breeds, people find it desirable to breed show dogs that look like winners - in this case the Siegers which were owned and judged into that position by 2 corrupt brothers. Let's also examine your contention that because the dog was originally developed in Germany that's where the standard should come from. That's palpable nonsense. The facts, as I'm sure you are aware, are that the majority of GSDs of good breeding were removed from Germany to other countries, certainly in great numbers after WWII but also, to a lesser degree after WWI. It is arguable that, in reality, there are many more GSDs outside Germany and that where they have 'evolved' naturally they bear no resemblance to the 'show' GSD now meeting the SV standard. Indeed, even in Germany there has been an outcry about how the SV have ruined the breed (search You Tube for a German TV documentary on the subject.) Although outside your article, the SV have tried to throw their sphere of influence wider by accepting Long Coat dogs. The German Kennel Clubs that represent such dogs, prior to 'amalgamation' have dogs with 'backs' that are straight from withers to croup - exactly as the dog was supposed to be. The UK Kennel Club standard still has that requirement (although the majority of show judges deliberately ignore it). As a person with considerable qualification within the breed I find it reprehensible that you don't speak out and tell the truth about this. And, while you are at it, look at the statistics for cauda equina in dogs in Germany (originally given by the SV warden as a reason to look at the gene pool but then suddenly removed from all websites which support the SV standard).
SV Foreign ListANKC Group 5 GSDCA Breed Surveyor