Here is an interview with the writer who wrote the biography of Kanbum Uechi.
Seth found it after I sent him the pdf of the book.
In this you will find a very interesting exchange...
(Sumida) How do you think Kanbun sensei would react if he were to see the Uechi-ryu techniques we now practice? His son Kanei did a lot of research into and made a number of changes to the style.
(Fujimoto) I think he would be most surprised by the circle block (mawashi uke) that is currently used in Uechi-ryu. Kanbun sensei did not teach a circle block and would instead use an inside-out parry (kake uke) for mid-section attacks and an upper block (hajiki uke) to defend against attacks to the head. I personally believe he would question why a circular motion should be used to protect against a strike to the face. Kanbun's students I talked to iejima who were with him in Wakayama sometimes said, "It may be that times have changed, but a lot of the karate used today doesn't seem to have much practical application." Of course, I recognize that the techniques of modern Uechi-ryu developed as a result of improvements made by our own teachers and am in no way demeaning their value.
I suspect that the circle block that we practice as Uechi curriculum actually was much more like the water hand of crane.. this is the first evidence I have seen that supports this. very interesting.