Are codices cumulative or replaced everytime a new one is released?
I've been arguing with a 'gentlemen' (*******) about whether or not the C'Tan may or may not be chaos deamons. According to the previous codex they simply cannot be, but if you take information only from the new one (and a significant amount of the C'Tans story has changed) it appears to be alluding to the fact that they are.
The crux of his argument is, I am assuming that the new codex completely overwrite the old one, and that in order to justify my speculation I must get a quote from the writers supporting this. I am arguing that he must also do the same thing, but it isn't going down very well.
What is your opinion?