Tentatively : maybe the shadows had just been thrown there as a substitue to make people who are athletic run after... shadows, while Mr. Cohen & his Intact Mystery still lead in peace a life in the art - for our utmost benefit ?
Who knows? Anybody knows. Not me, anyway.

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P.S. :
Warning! Not for people who do not want - under any circumstances - to get dizzy and sometimes experienced discomfort - from light to ooch! - when they are turning their conscious toward the inner self, besides a lot more pleasant discorevings.
The shadows point toward the concept of "shadow" as it is understood by Carl Gustav Jung. He (helped by a squad of other scientists) made the bridge between West and East philosophies.
Shadow is whatever lay in our subconscious. Bad, but good, also. Anything that we are not aware of consciously, and are active in our subconscious.
Shadows give some hints to the conscious using the subconscious language, which is expressing itself by metaphors and images. It is to the conscious to decipher, if the person is willing to do it. First : to be aware that there is such a process. Second to be attentive to it. Third : to understand that the langage of the inconscious is not logical and to know that some valuable knowledge comes also from non-logical.
The side of Christianity obsessed whith unsane guilt (I stress guilt, and not sin, as sin just means "error" - not judgment, not punishment - but to have to support unpleasant experiences of errors are just plane consequences that go with any error. But now sin is so associated with guilt and good luck with this now in term of psychological sanity.) Besides, there is a sane guilt which is not to be thrown with the bath's water, like in "don't throw the baby with the bath's water".
Therefore, your shadow is not "your evil twin". It is just you, parts of you that you are not fully aware of.
It is said that enlighted beings have explored every inch of their inner self, they don't have shadows anymore. They are not perfect. They are not perfect. They are not perfect. They are just perfectly conscious.
Which would help them not to make so much mistakes as others do.