Because of comic feats:
Flash solos. All that speed force, time travel, dimension dumping means he'd erase GR and Iceman from history.
Now, putting that stupidity aside, neither really have a way of defeating GR. I don't know if Death Seed or Void Sentry can conjure a holy weapon to defeat Zarothos Rider, but it's to my understanding that he's immortal and cannot be defeated any other way.
Iceman, in comic land could I GUESS mess with the water or whatever inside Sentry and Flash's body, but back on earth, you know, where Iceman's power don't make him a damn Herald of Galactus, he doesn't belong here.
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