This is what the Bills get this year:
1st - 1
2nd - 1
3rd - 1
4th - 2
5th - 2
6th - 1
7th - 2
Likely the first 4 rounds picks all make the team. Assume one from the 5th and one more from the 6th and 7th. That is 7 rookies or 13% of the 53 man roster. Imagine trading down in the first for a 1st and a 3rd. Throw in a undrafted rookie and your up to 9 or 17% of your roster. At some point, and I don't know what that point is, the inexperience becomes a liability especially early in the season. IMO, they would be much better served if they traded down and got future draft picks. For example instead of a 1st and a 3rd a 1st and next years 3rd.