I will say that they attempt to trade up somewhere in the 19-24 range to secure one of Paye or Newsome, if they are still there. If neither are there...
They stay at 30 and take one of the Edge rushers who remain between Phillips, Oweh, or Rousseau. If none of the three are there...
They take Etienne. If he is not there...
They trade out of the 1st Round.
Scenario nobody suspects: They eschew Farley's medicals and swing for the fences on his talent.
If you're pinning me down for one, I'll say they end up with Oweh because he has the type of measurables they covet and they will hope to coach him up. If they can't get Newsome but Farley is still there at 30 and they truly don't trust his medicals, I think they'll wait to grab their CB in Round 2 or Round 3. I also think they'll take at least two CBs in this draft (three, if you include S).
GO BILLS!!!