I won't argue with what you said Rob!  First its the skills, but to what percentage does the ball make a difference?  HOW A BALL IS DRILLED is in my opinion HUGE ALSO!
You can have any ball drilled so MANY WAYS, and it makes a HUGE difference as to how that ball reacts.   I think bowlers should EXPLOR different methods, JUST to SEE how a different drilling reacts to their style and delivery!  
NO MAGIC BALL OUT THEIR!  Raw talent number 1, then having a ball drilled to suit YOUR STYLE of bowing and lane conditions number 2, then make and model of ball!  
I think most bowlers I know all go to their driller and say:   ( GIVE ME A BIG FLIP, HOOK at the END!)   
What many wind up with is a real jumpy erratic ball!  especially as the oil begins to transition.   
Try some Pin downs along with pins up kicked out to the right  of ring finger......explore the difference in a ball!   Any good ball can do remarkable things when you lean the secret of how to drill it to suit YOU!   I say drilling is 50 percent of the goodie your going to get out of a ball.   
A BALL IS ONLY AS GOOD AS IT WAS DRILLED, and then its UP to YOU!  (

 
			
		
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