Actually, i've used the extension tools to verify that the C is leg is between 1.13 to 1.414 extension of XA leg. I just like using the default tool to draw the pattern.You may check your check your chart to see if i've incorrectly drawn the C leg.
Ahhh...the internet! Taking the whisper game to the extreme! Here's the fact coming from the source of the cypher himself. Akil Stokes works with Jason Stapleton who discovered the Cypher pattern. So you can rely on what he says is the absolute truth. If you haven't, you should take his course on harmonics and trading in general. It's excellent.