Alternates are all three Canadian dance pairs, and Hubbel and Donohue. ( Yes, Virtue and Moir are also a 'Duh' but wait after NHK)
I believe Hubbell & Donahue are officially in the GPF. Only Papadakis & Cizeron and Virtue & Moir have a high enough ranking from their previous competition to pass H&D's 26 points.