Ummm... how else do you propose to ascend the rope? Bite the rope with your mouth while you slide the other one up? 2 ascenders per person is standard.
One wants two ascenders/team (not person) dumbshit.
So how exactly would 2 people ascend the fixed lines on the second day with only 1 ascender each?
Body hoist. Duh.
But this means you are carrying two Grigris.
Of course, ascenders can mean Tiblocs.