I think they had gotten so far down the replacements list with pairs at that point that the rulebook had to be thrown out in order to get full fields. Plus, Ruest/Wolfe were replacing MT/M so they were probably trying to keep the entry Canadian. Rememeber that Duskova/Bidar and Alexandrovskaya/Windsor were in juniors, and many US teams were injured, along with Sui/Han and Stolbova/Klimov.....and US teams like Cain/Leduc and Stellato/Bartholomay were a little too new to be considered. As it turned out, the only US pairs on the GP last season were Kayne/O'Shea, Denney/Frazier, Castelli/Tran, and Pfund/Santillan. Every pair that had finished 2016 Worlds who wasn't injured or pulled by their fed (French team?) was given 2 events already, and the only team from Euros with a decent score to not get a GP was Danilova/Kamianchuk, who competed at Warsaw Cup a little over a week later.
I think its neat that they have all the rules written out, which seem to usually apply, but I'm glad there are unwritten "common sense rules" that come into play when everyone else is broken.