I honestly would say that albinos aren't necessarily less aggressive, but they are in my opinion more likely to be less hardy and they are much more likely to be picked on by other fish.
That being said I know of some Eurekas that become the boss of the tank, but more often then not I hear of experiences that you have had niqolas619.
Anyways I would like to see some pictures of the guy when you get him. Even if he isn't "pure" I am of the opinion that if the fish looks cool then get him, just don't try to sell off spring as anything but unknown, but cool fish.