Personally, I have come to the conclusion that the way the gokyo pin is usually done is wrong. Anyone with a bit of strength is going to be able to resist the elbow bend. For me, it makes more sense to consider putting pressure on uke's thumb to take away the knife to be the first/basic move. This might likely be resisted by uke trying to pull his arm in. Using this resistence, one could then do the trad. gokyo pin without forcing it.
Also, Shirata Sensei had a very different version of gokyo, shown in the book The Way of Harmony. Shirata Sensei's system, taught to me by John Stevens Sensei consists of series of techniques, similar to the Daito ryu system described above. For example, katadori nikyo was not a singular technique, rather a series of 10 different variations.