GotBowAz,
You are drawing a very simple conclusion with your analogy in regards to football. With all things being equal you are completely correct, but things aren't equal in this case. Let's use your sample but instead of pads and a helmet which animals don't have it is just a person trying to tackle you. Instead of your hand and arm you have a razor sharp sword (foil style) to get the dimensions correct. Now you are running at this person at 280 fps and you stiff arm him whats going to happen? The Grave Diggers kickout blades are sharp to the point (no blunt edges) so they penetrate like no other mechanical. They are not jack knifing like you suggest as the blades are crossing each other. Now if you have a rear deploying head with a blunt edge to push the blades backwards how is that going to help you? If you say that the tip will penetrate and it will deploy in the animal then you have to say the same thing about the Grave Digger as the tip will get to the animal before the kickout blade anyway, and if not the kickout blades are designed to penetrate.