Was wondering the exact same thing!

Was I wrong to assume the possibility that the defendants could have been questioned at different times? Where was it implied that all defendants were being questioned simultaneously, or is this just the common court process in these circumstances?

Take exercise #2: The vote to grant Chancellor Palpatine emergency powers will not pass only if Senator Amidala delivers her speech. Amidala cannot deliver her speech unless the attempt to assassinate her fails. Her assassins planted a bomb on her starship but unbeknownst to them, she was not on the ship when the explosive detonated. Therefore, the vote to grant the Chancellor emergency powers will not pass.

Notice how I added only in front of if in the first sentence. This would make the argument valid, right?