The question we should be asking: is how did Iran capture a  stealth drone intact. The world has known about stealth fighter planes since Jimmy Carter was President, which any one could figure out how they worked that knew anything about radar.
How did Iran take over the controls of the drone might be more important than having a nuclear bomb. This is what should keep the Pentagon working on at nights and on the week-ends. Having the power to turn the direction of a missle would be greater than being able to shoot it down.