Super free agent:
There is a fake free agent player, Sabrina Ladha, a goalie with a 98 OVR rating. To make sure she does not end up playing for another team in your Dynasty or Be A Pro mode, use the "Edit Player" feature in the creation zone. Get to the free agents and go down to "S. LADHA". Edit her ratings down to "50" on everything. This will ensure that nobody signs her. Alternately, choose to sign her to a team that you will not be using or playing against, such as like a European or National team.
If you are playing as the New York Rangers in Dynasty mode and want a better defense, sign Karel Rachunek from the free agents and trade Kalinin and Roszival for Dion Phaneuf on Calgary. The trade should be accepted and your defense should be improved by at least 3 points.
Come up from the left or right wing whatever is best for you, then take a slap shot five hole. About 90 of the time it will go in.