A friend of a friend of mine, lost his right thumb in an accident a while back. Yet, he still plays and is extremely good at playing shooters and other games on his 360. I know he plays CoD4 competitively online. When I say lost his right thumb, I mean there isn't even a stump there. It's completely gone, but he found a way to play. I haven't seen him do it, so I can't say how he does it.
I was refering to the style of holding the controller that Walshy from Team Final Boss uses to hold the controller while playing Halo 2. Called "The Claw", it's a style of gripping the controller with the right hand that allows him, or anyone using the grip, to use the a, b, x, and y buttons without removing your thumb from the right analog stick and still being able to use the trigger. It's mainly just repositioning the hand to be able to work every function on that side of the controller.
I was refering to the style of holding the controller that Walshy from Team Final Boss uses to hold the controller while playing Halo 2. Called "The Claw", it's a style of gripping the controller with the right hand that allows him, or anyone using the grip, to use the a, b, x, and y buttons without removing your thumb from the right analog stick and still being able to use the trigger. It's mainly just repositioning the hand to be able to work every function on that side of the controller.