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The fight takes place in Earth S, where they're at their most powerful (Adam and Cap couldn't even hurt each other, and had to rely on tactical use of the magic lightning.)

Team 1.
the PC adam and marvel were juggernauts, cap fought spectre and black adam had to be bfrd across the universe by a skyfather.
superman even states "wow your so powerful "after being merged with Cap

The Cap that fought Spectre was Day of Vengeance, not Silver Age.

When Superman and Captain Marvel merged it was Kingdom Come, not Silver Age.

Dont know about the Adam feat though.