I would be more optimistic if upon learning that Twilight was Angel, Buffy hadn't immediately thrown herself into his arms for 'twu wuv'. I'm not even concerning myself with the shippiness of it as my vampire vs. another vampire thing, but in terms of Buffy basically discovering the lay of the land and yet she's incapable of sustaining wtf outrage for more than three seconds. Unless glowhypnol is the case, she basically overlooked the deaths of hundreds and her months of being manipulated because OMG, it's Angel!