All they do is tell the refs how many of the 7 Canadians are on the field on O and D. Then that's the minimum that have to be on the field every snap.
No difference if you put Shay's name in front of Jones'
The ratio is no problem in this game. They don't even have another American backup on O dressed to take the spot anyways.
Next week if Brady can't go, they start Cooley and flip to 5 on O, 2 on D...probably sit Ayres if no one else gets injured before then.