Draft Grades
The draft grades are based on projected scoring. Some teams decide to only draft one QB, TE, K and DEF at the time of the draft - than fill in as needed during bye weeks. Yahoo's draft grades penalizes those teams - and assumes that team will score zero points during those bye weeks.
A better way to grade drafts is to fix that issue. Teams with no qb on a bye week will pick one up - but maybe by having an extra RB on the squad in the early weeks of the season will benefit the team in the long run.
83rd
ranked

Hey Charles,
Thanks for your feedback.
We will pass along your feedback to our product team.
Thanks,
Product Support