Hold R the moment you tackle a player to hit them harder. If a CPU on your team gets to him first, still hold R at the moment they are about to tackle.
Choose the Dallas Cowboys in Franchise mode and trade with the Chicago Bears. They will give you anything for La Roi Glover. For example, you can trade Glover for Urlacher, a first round pick, and Thomas Jones, which all three have a rating of A+ but they will still take the trade.
