Here's something I've never fully understood, I remember it happening to Deion Branch in a regular season game against Denver in 05. Deion caught the ball, came down hard on his back and the ball popped out. This is essentially what happened to Moss against the Cowboys on his would-be highlight reel grab. My question is this: If "the ground causing a fumble" negates said fumble, why doesn't the ground causing an incompletion negate said incompletion and result in a catch. If Moss catching that ball and getting two feet in bounds = possession and a catch, doesn't his landing on the ground and having the ball pop out as a result of the ground essentially = "ground causing a fumble"? I know that it's not the case, I guess I'm questioning why it's not the case.