They are treating Vegas as if they were the third-worst team this past season, so the Avs and 'nucks have better odds than Vegas does. Since the NHL will draw 1st, 2nd, and 3rd overall in the lottery, the Sabres could end up with #1, #2, #3, #6, #7, #8, or #9.
I would look at it this way: The Sabres have a 59.6% chance of drafting 7th or 8th.
From wikipedia (hopefully formatting is good with line-wrapping):
Team 1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th 13th 14th 15th
Colorado 18.0% 16.0% 14.1% 52.0%
Vancouver 12.1% 11.8% 11.3% 34.0% 30.7%
Vegas 10.3% 10.3% 10.1% 11.8% 39.3% 18.1%
Arizona 10.3% 10.3% 10.1% 2.1% 22.8% 34.6% 9.7%
New Jersey 8.5% 8.7% 8.8% 7.2% 33.0% 28.7% 5.2%
Buffalo 7.6% 7.8% 8.0% 14.3% 38.2% 21.4% 2.6%
Detroit 6.7% 7.0% 7.2% 23.4% 39.7% 14.8% 1.2%
Dallas 5.8% 6.1% 6.4% 33.7% 37.9% 9.5% 0.5%
Florida 5.4% 5.7% 6.0% 44.7% 32.7% 5.4% 0.2%
Los Angeles 4.5% 4.8% 5.1% 56.5% 26.4% 2.7% 0.1%
Carolina 3.2% 3.4% 3.7% 67.8% 20.7% 1.3% <0.1%
Winnipeg 2.7% 2.9% 3.2% 76.4% 14.3% 0.5% <0.1%
Philadelphia 2.2% 2.4% 2.7% 84.3% 8.3% 0.1%
Tampa Bay 1.8% 2.0% 2.2% 91.2% 2.9%
NY Islanders 0.9% 1.0% 1.1% 97.0%