Morals-Off: Who is the biggest threat?

If you saw the Flashpoint anime that's why I say Aquaman.

Flash Blitzes everyone. And if he can't hurt them, he dumps them into a speedforce. Flash is a beast in this type of scenario.

Flash

Superman.

Flash, Cyborg, Because of Cyborgs ability to control computers, which, pretty much is running most if not all of modern civilization, he, like Superman or Flash can be pretty much anywhere in seconds. And can pretty much do whatever he likes, couple that with his ability to bring in an army of Apokalips worst and sale us out hard he is a bad mojojojo

Barry Allen. With his speed he could wipe out life on Earth in a second. Depending on which version of Barry this is he could just vibrate to another dimension/reality and do it again.

Flash.