Article I, Section I states ‘All legislative Powers herein granted shall be vested in a Congress of the United States, which shall consist of a Senate and House of Representatives’; it says nothing about delegating those powers to independent agencies or to executive agencies. None of Congress’s enumerated powers state or imply that it may delegate its power to anyone else.
It would be pretty surprising if a law passed by Congress delegating to Charles Windsor its power to write the laws about taxes, borrowing money on the credit of the United States, regulating international and interstate commerce and so forth were constitutional.
> None of Congress’s enumerated powers state or imply that it may delegate its power to anyone else.
That may be what you believe, and there's been a lot of debate over that, but courts have time and time again ruled that the legislature can delegate power. Maybe current SCOTUS will reverse a lot of that, but that remains to be seen.