And that's really interesting (and puzzling).
You are clearly intelligent, well educated, etc. and blah blah blah.
Yet, you somehow missed that.
If you can explain why, it would probably be something we could all learn from. At the very least, it would be interesting.
Is it because you learned x86 before you learned octal and never really reexamined the encoding?
(The PDP-11 machine code also looks best in octal, btw.)