The real question is why don't they use Icon & Rocket especially since Hancock has proven that you don't need to rely on the Superman name brand to make a successful black Superman.
Density Manipulation is your answer. Not only would you be insanely durable to the point where the speedster couldn't physically hurt you but if your dense enough you can pull one towards you with the gravity you generate striping superspeed of one of its main advantage especially if you add density to multiple things.
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