Seems like all international sports have guys (based on race and build) that are good at part of a sport or a specific position but weak at another.
At BYU, they may have the perfect mix to be really really good and dominant for a long time.
The strength and power of the Poly players, the speed of some of the smaller poly, euro and NZ/Aussie players mixed in with the depth of experience from the international players in general, and the technical and strategy of the euro players seems like a perfect mix.
Too bad Rugby isn't as big as NCAA football, because BYU might just be Alabama if it were.