(1) You copied and pasted a 1996 "unauthenticated" something and a 1993 publication
by Blackwell publications that calls itself a "guide" and refers to the IUPAC rules and
states that E/Z has largely replaced cis / trans. I'm not arguing with that.
Quote comes from the very Blackwell publication, "unauthenthicated" probably refers just to the legal status of the document (which is not something I selected randomly, it is linked to from the IUPAC site itself
P-92.1.2 states that CIP rules are used to prioritize a,b,c,d
That would be a game changer. Sadly, I have no access to the book, and the only thing I can check is the IUPAC Provisional recommendations which says nothing about using CIP for cis/trans (to make things more difficult it also uses different, and occasionally erroneous, numeration of subpoints).
IUPAC isn't always consistent
is a thing I can easily agree on.