Darwin's theory is whatever IDers want it to be.
I'm always amused that Darwinist evolution stands alone on a self-fullfilling prophecy. Why does an animal have certain traits? Because the traits gave it competitive advantage in the survival of the fittest. What is the proof? The animal has certain traits. Its really quite circular.
Thus most Darwinists have no problem accepting that traits that should clearly be self-eliminating like diseases that occur before reproduction and homosexuality continue, while simultaneously insisting that a 1mm extension of a Giraffe's neck every 100 years gave clear competitive advantage. The proof? Well that's the way it is, and the only accepted mechanism is survival of the fittest.
I accept evolution, but question the "theory" that all changes are the result of competitive advantage. Interestingly, that small differentiation is always enough to bring the wrath of every Darwinist down on me. That gives me the impression that Darwinian Theory has become more of an orthodox doctrine than a scientific theory.