I personally think that Caius hunted down the true Werewolves for vengence and just used safety as an excuse. Whoever wrote about the competition for resources stuff was right though - the other vampires were only willing to go along with it because they want to have more food , or drink in thier case. The true werewolves I imagined were like the ones in Buffy but more regal and with lighter fur - or for another example to those who don't watch Buffy ( which is awsome ) like the wolves from the Icemark Chronicles or The Harry Potter Books ( not films - there's a big difference)
And about Aro and "guard dogs" I think that he was probobly joking but no doubt he did think that it would be cool - however I don't think it would work - it goes against everything the werewolves believe in, they only managed to work with the Cullens because of thier diet and even then they weren't exactly happy. But the volturi kill mercilessly and would provoke the wolves too much and the pack would end up killing themselves in an attempt to destroy the volturi. Plus I doubt Caius would want such an alliance.




I would think he saw the Treaty between the wolves and Cullens. Also, Aro did see Alice's memories regarding Bella telling Alice that Jacob was her best friend and a werewolf. I didn't understand why the wolves were such a surprise to Aro or why Aro wouldn't share that information with the rest of his coven and guard.