no, the sentry's dog is alot cooler than krypto, hes small and cute lol.. and no superman cannot have a monoply on having the world on his shoulders that can be held by anyone with big responsibilites. and every golden age character had cheesy coustumes, the L thing...so? so lets say iron man goes out and marries a woman called lorraine does that make him a copy? yeah the bullet thing was satirical in manner they did that on purpose and yeah the threat thing isnt just reserved for superman it can go to anyone thought to be..