Michael Dubner uses the DFS Lineup Optimizer and other RotoViz tools to prepare for Week 9 GPPs on FanDuel. Large-field GPPs are primarily won in three key areas: 1) player projections, 2) roster construction, and 3) ownership. Groupthink can run rampant through the fantasy football grapevines and cause DFSers to concentrate on just one scenario in a player’s possible range of outcomes. What was once a...