TDC57,
Im glad you dont allow you equipment to get dirty. People need to understand the differences of where the ball hooks and stop confusing this matter. Good example, I have 2 Storm Crossroads. One with a strong drilling and a 600 grit surface, one with a weaker drilling and a 2000 grit surface. I can cover more boards with the weaker ball but have more hook on the heavier patterns with the stronger one.
A gentleman asked me about it because he saw my strong one not covering as many boards and thought the ball was dying. I then had to explain to him the difference to which he still looked confused. The more surface, the earlier and smoother the ball reaction. Even on my 2000 grit, when I apply a 2000 pad it smoothes the backend of the ball. As i throw the ball more, it shines, and the ball covers more boards, seeming to "backend" more.
As for your friend, his tilt, axis rotation, rev rate, speed, the lane conditions, are all at work to deliver the reaction. Their are people with lower rev rates but have a low tilt so they get the ball to axis faster thus creating backend reation and covering a lot of boards. Just depends on the bowler.