[Sardy]

Also, Saruman would have used his extensive Ring-lore for GOOD. Since we know he constructed some sort of ring for himself (open to much speculation) he might've devised something for use against the Enemy. Or at the very least, his knowledge of the Ruling Ring, the Nine, the Seven and the Three (not to mention other lesser rings) could very possibly have been used against Sauron in ways we can ony imagine: whether Saruman knew of alterntive ways to destroy the One, flaws in or aspects that could be exploited in the design of the rings themselves, and so on...