Again, what are you basing that on? Perhaps there is a small element of luck involved with recovering a fumble, simply due to the shape of the ball and erratic nature of the way it bounces. But forcing fumbles certainly isn't luck. And interceptions? I'd say very little luck, if any. Being in the right position, baiting a QB into a throw, rushers pressuring a QB into rushing a bad throw, tracking the ball in the air, out-muscling a contesting receiver, actually making the catch and holding on...which one of those elements screams "luck" to you? Anxiously waiting for you to enlighten me.