SrKegler -- Scroll down to the bottom of that page and click on the right hand small picture to see the holes (the large picture will change).  I'd guess it was to remove finger weight, possibly to make the ball break earlier, but don't know why he didn't just drill deep finger holes.  The pitches can be adjusted so the holes don't come together at the bottom.  The way the ball is drilled, it would have to have extremely high undrilled top weight to be illegal after drilling.  Also, it looks like a layout for a leftie.  -- JohnP

The adj appears to be a decrease in finger and top.  It's the old school way(usually above the bridge so you don't feel the hole in your grip) to just punch a hole vs working a little harder to drill deeper thru fingers, maybe the guy doesn't know how to drill the correct laterals so the fingers don't meet.  If set correctly, even my conventionals don't meet(2.5 inches deep).  Then again...could be for the "King of all spinners"...lol  

Another possibility is that this guy/gal had success with one ball drilled like that so now he/she wants them all like that, bowlers are funny that way...