MSC,

If you are saying that he just "flings" it down the middle of the lane, getting a new ball will not help carry those 5 pins.  The reason being that he has no angle on the head pin to drive through and knock out that 5 pin.  This is pretty vague, though, because you have not said anything about rev rate for this guy.  His ball speed is pretty average, but with no knowledge of lane condition and rev rate, it will be hard for us as well to peg that specific ball you are looking for.  If you could help us with that info, it will help us get a better idea on what suggestion for a bowling ball we can give you.  However, if you are specifically looking for an entry level ball, regardless of the other info, something like a Power Groove or Tornado Warning would suit you, or him, just fine.
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If anyone out there is worried about the scores being too high, try duckpin!!

Lane conditions that we typically bowl on- for a bad night, a reverse block (significantly drier in the middle, higher amounts of oil from outside of 10 on both sides), on a decent night, more of a short oil flat pattern (usually 22 feet buffed to 34 feet).

As far as his rev rate, I would say a very low rev rate, as his motion through the delivery I see the ball rotate about 6 or 7 times before it hits the pins. That's why I'm thinking anything beyond a mid level resin/particle would be useless for him, as he doesn't play the outside of the lane very much.

And yes, this ball would be specifically for him- I already have 4 with a 5th waiting to be plugged and drilled, and my style is much different than his...

Matt