Angry Birds on Android was launched off of the success on the iPhone though. Not that invalidates their success on the Android platform or anything, just that it doesn't speak to the power of the Android platform, since it probably would never have happened if not for their previous success on the iPhone. I.e. the Angry Birds story is not a good example of when focusing on Android rather than iOS would have been a good idea.

Can you think of any Android exclusive app or game that is achieving a similar success? Then that app is probably a better example.