Mass Bias placement

Question
Hey Chip, would like you input on mass bias placement on a ball.  i've read a drill layout that says if you place the mass bias on your track that it will create a more arcing motion down the lane.  Is this a way of saying that the ball will be less aggressive or lose hook potential than a ball with a mass bias placed on the thumb or the other side of the ball (opposite your track side)?

From seeing several balls, it seems like the pin, cg, and mass bias rarely form a straight line down the ball, the mass bias marker is usually kicked to the right or left of the pin and cg.  With that said, does the cg have to be some where between your fingers and thumb nowadays or can it be placed out to the left or right of your grip to get the mass bias off your track?

I guess, long and short of it I抦 just wondering if having the mass bias on your track is really a big deal and if it really changes what the intended reaction of a bowling ball is.  Can you help explain all that?  

Thanks Chip.


Answer
My experience with a mass bias placement in the track tend to make the ball hook/set at the backend.  Placing the mass bias right of the thumb makes the ball read sooner and makes it arc more.
The importance of the CG placement really is all about the need for an extra hole.
Mass bias placement is more of a fine tuning tool for ball reaction.

Chip