## Why "the heir apparent to" instead of "the apparent heir to"?

5

Einstein was propelled to international prominence as the world’s newfound scientific genius,
the heir apparent to Isaac Newton.

Why isn't it written this way (the only difference is the highlighted phrase)?

Einstein was propelled to international prominence as the world’s newfound scientific genius,
the apparent heir to Isaac Newton.

Also, please mention weather there exist an alternative approach to connote what the phrase
"scientific genius" (and in general, "[adjective] + genius") conveys. For instance, would the phrase "scientist of genius" be a proper substitute in the given context?