It's amazing how one can ignore the fact that in Pesh Kabz the reinforced tip reaches a maximum of 1/4 of the blade (in the unique case of 1/3), while in the Zirah Bouk the reinforced part of the blade is - 1/2 of the blade.
And of course it's strange to quote Stone's book and keep silent about what illustration he leads
Compare the illustration from Stone with Zirah Bouk and Pesh Kabz. The answer to the question that there is something that is easy to see.