Fury had 1 cut on his eyebrow. Vitali had 4 cuts on different parts of his face, one on the lip, one on the eyebrow, one on the cheek and the cut that actually forced the stoppage was the one on his eyelid, not the eyebrow. Vitali's eyelid was hanging off and the doctor could tall it was blocking his vision because Vitali had to turn his head all the way to see him.
Vitali's injuries were a lot worse and needed more stitches as well. However you are correct that the Fury/Wallin fight could've been stopped.