Gladiator has a Supermaish power set and a like Superman is one of the few remaining members of his race. Similarly Hyperion is also the last of his race. He's also been given an alliterative secret identity that uses glasses as a disguise.True. But neither Hyperion nor Gladiator have a huge amount in common with Superman other than being the most powerful flying brick of their respective teams, and yet each is recognized as a pastiche / homage to him.
The Guardian is just an athletic cop who put on a costume to crime in his neighborhood. He's not a super-soldier or a guy who's been training to fight crime since he was a child.In Guardian's case he's a peak human carrying a shield and he was created by Simon and Kirby. Even if we don't recognize him as a homage (or even a ripoff), it's still worth noting the resemblance.