The Dallas Cowboys are switching from a 3-4 to Monte Kiffin's Tampa 2 scheme, and they'll be looking for the right personnel to help with the transition. Most people expect them to address this issue in the upcoming NFL draft.
The Cowboys would be fortunate to land a gap-splitting defensive tackle like Richardson with this pick. He's by far the best player available, though his attitude may rub some teams the wrong way. Moving to a 4-3 defense, Richardson is the exact kind of three-technique the Cowboys need.
Dallas also needs help on the offensive line and safety, so guys like Flukeer and Cyprien would make a lot of sense at this spot.
Of course, with free agency just hours away, this mock draft is going to have a ton of changes over the next few days. Keep checking over at Mocking The Draft for updates.