coherence trumps consistency
Breaking news suggests that Rovio are set to publish an egg recipe cookbook as part of the evergrowing Angry Birds franchise.
And why not.
Angry Birds is now a bona fide brand with a bona fide story.
Finding the brand story is the hard part, and they have cracked it. So to speak.
Coherence trumps consistency.
Once you have the story nailed it can go anywhere.