 Devadatta's reasoning was that after he had proposed those rules and Buddha had not allowed them, Devadatta could claim that "he" did follow and practice these five rules, making him a better and more pure monk.One of these five extra rules required monks to be vegetarian.In the Contemplation Sutra, Devadatta is said to have convinced Prince Ajatasattu to murder his father King Bimbisara and ascend the throne.