it might help to deflect a pass every once in a while but good defense isn't played with the fingers. It's played with the hips, feet, and eyes. Anticipation, reaction, reflex, lateral mobility, vision, intensity, bbiq...all those are much more important than wingspan. Sure, a long wingspan can occasionally help when a player is beat off the dribble; but if he has those other attributes, he won't often be beat off the dribble. In other words, if has has those attributes and combines it with good wingspan, that's great. But just wingspan alone won't do shit