Psy: actually, according to my former English teacher, it's apparently okay now to split infinitives. I still, however, strongly disagree with it, and for the most part choose to disregard that knowledge.

Nope! Maybe in US grammar, but in England it's always been fine to add an apostrophe at the end of words ending in 's'. If there's already an 's' sound, it just sounds ridiculous if you have to add another 's' sound to make the possessive. "Jesusiz blood", anyone?
But then how could you possibly distinguish between Bley's crotch and Bleys' crotch? It makes absolutely no sense. It's fishes' scales, but Bleys's crotch. Proper nouns ALWAYS go by standard grammar rules - therefore, unless it's plural, add 's. It's the same logic behind "Final Fantasys." If you refute one, you can't possibly justify the other.