#51 is a koshinage? I had thought that the koshi throws didn't actually come from the Founder. Not so?
Did Budo Renshu not specify footwork for #50? I learned it with crossover footwork you're not showing there.
There is a interview with Saito where he claims that koshinage was one of Ueshiba´s favored waza. I think that it was the more koshi guruma-like koshinage with feet together that Nishio introduced to hombu.