I agree with most of what has been said here. Urethane can be a great option in the right hands on the right conditions, but you have to know where and how to use it. Plus, you have have to get used to the roll/hit characteristics, which are often very different than what most bowlers are used to.
As such, I would consider messing with his current stuff first before plunging into buying a new urethane ball. If too much motion off of the spot is the problem, he may want to consider using some of his more aggressive balls. Put some surface on something strong, and let the ball bleed some energy up front, which will lessen the pop on the back. The problem with balls like the Breeze is that they save every ounce of energy they have for the back end. That's why you'll see people reporting that their Tropical outhooks their Crux. If thrown on the same patterns, the Crux may burn up and die while the Tropical stores all of its energy for a huge move down the lane.
Again, I'm not trying to steer your friend away from urethane; I think urethane balls can be great, but they're not for everybody, and those who use them have to know when and how to do so as well as what to expect from them. As such, again, I would recommend having him try different balls, different surface preps, and possibly even redrilling before buying a urethane piece. That's just my .02.
