you shouldn't be scored relative to what the other riders do... how would you score the first person then? How would you like it if you were writing a school report, spent hours on it, did a bang up solid job on it, meeting all the requirements of the assignment, but then some keener went insanely above and beyond the call of the assignment, the teacher happens to mark their assignment first, and gives everyone else crap grades, including the people that met every requirement of the assignment but did not go insanely above and beyond.
now i understand that this doesnt totally correlate, and that obviously there's some debatable points there, but it just seems to me that you shouldn't be scored relative to the other riders, you should be scored straight up on your run. Do an amazing job, get a high score, but if you falter at all, you shouldn't get 100. Again, in school, teachers generally hate giving out a hundred, cause it implies perfection and you failed no where. His run was not perfect, therefore he should not have been scored 100.
