Not sure why you feel this is ending diagonal. I originally slipped up and said it might be but that was very early on. However. Ending diagonal would be a patter to see after intimal decline and then retracement followed by this ending diagonal. Hence it is called so. But in this chart it seems it is commencing from Nov 2013 high. So it would have to be a leading diagonal rather than ending. Also, if the wave 5 = wave 1 on throw over, it would violate the rule in that wave 3 would be the shortest. Hope you don't mind me sharing this with you.
i believe we have different counts. im unsure if you are aware of my count. wave 3 was very strong (2.618*wave 1). so its reasonable to assume wave 5 would not be strong enough to go beyond wave 3 so i realized it may be an ending diagonal developing for the final wave. as you know, when there is exhaustion in trend such as strong wave 3 market create ending diagonal .
this is my wave 5 of C. again we have different counts i believe so i couldn't follow your chart.
regarding wave5=wave1, i was reffering to a larger degree wave 1 on another older chart (not the wave 1 of diagonal):