Ovechkin, Crosby, and Iginla would spend so much time in the opposition's zone scoring goals that defensive play wouldn't matter. And if for some reason an opposing player escaped into the neutral zone, Ovechkin and Iginla would just flatten him anyways.
Then Crosby could skate by, trip, flail around untl the ref called a penalty, and they would spend more time in the opposition's zone scoring goals.
Just kidding on the last part. Or am I?