I could see Stepanova & Bukin invited to SC or SA by default. SC may prefer not to invite C&B. And G&P may prefer not to go to SA, where they have lost to Sinitsina & Katsalapov twice now. G&P have a pretty good argument for going to SC along with W&P after finishing above them at Canadian Nationals. But . . . I don't know . . . I don't really see Chock & Bates going to SA with Hubbell & Donohue.S/B will get Russia but can't get France, it's only one week later. Plus no US or CAN since it's C/B and G/P countries, so that leaves China.
If it plays out that way, S&B for SA.
All of this, of course, presuming Cappellini & Lanotte don't compete. Or sign up to compete and then drop out after the fact. (That would be nice & messy).