You mean a key flaw is that the games actually require players to think occasionally?

The key flaw in Ike's strategy was military, not political.

Strategists for Mr. Dole argue that the key flaw in this approach is the general nature of the questioning.

The key flaw in term limitation is that it punishes experience.

The key flaw lies in the way the patient in the play feels when she's under hypnosis - as if she's somehow moved outside herself.

And key flaws brought out in the reviews include:

To the Editor: It seems that a key flaw in our educational approach is that all the students are given the same general curriculum.

Education experts say that a key flaw in the New York model was an unclear role for parents.

That was the key flaw in the existing prospectus directive and again we are very pleased at the development of the text.

I was all ready to get riled up at the title but you raise a few interesting ideas, the key flaw in your argument however is: