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Heyyy...wait...wouldn't it be funny if Billy Batson meets Detective Conan and the Scientist Sherry??? Wouldnt it be funny if Batson just met other people who could do stuff like he does albeit just by changing their ages?
Except, Batson doesn't know that the adult Sherry and Conan is their real identity and not the kid identity while Conan and Sherry thinks Batson's real identity is Marvel and the kid version of him is just him wanting to hide his identity for rest time.
Even then, Sherry and Conan still treated Batson like he really was just a normal human kid cuz for some reason, they can't help it. Batson was too energetic unlike them.