http://www.sportingnews.com/nfl/news/nfl-draft-rumors-quarterbacks-sam-darnold-baker-mayfield-josh-rosen/k2o3vl3ntwmv130v4xuwokguq
Interesting article. The author owns a scouting company that works with some teams. In the last paragraph he mentions the Bills as one team that could trade up to get Rosen.