No, I think you have very good 'thumbless form'. Besides the knee bend, and getting the ball down sooner, you look pretty good. I know its hard to get the ball on to the lane for you though, because I can see that you get your hand way under the ball before release, so this makes you lift up on the ball, more then rotate it.
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....BRUNSWICK!
¡Viva la nación de Brunswick!
Nothing more to be said.
....DEATH BY CHEETOS!!!!