I never saw Sumners as a strong jumper. Even her best performances over the years, she seemed to barely eek out her jumps. She did have a beautiful double axel when landed, but thats it really. Its why she lost the 84 Olympics to Witt, who at least did have good jumps.
As for Biellman I had her over Butyrskaya, but in rethinking it I do agree she didn't really hit to anywhere her potential as an amateur except one worlds she won and the Olympics in Lake Placid. Bute at least had successive medal podium finishes at major competitions.