Could Biden win the election to be President, get sworn in, then write an EO giving the executive powers to someone else?Unlike some this isn't a I'm right you're wrong thing for me just show me the legislation defining the form and I will agree he is overriding the legislature.
Could congress delegate their committees and votes to others so they can fundraise and campaign?
None of that would be constitutional because the powers are vested in the person or entity the constitution specifies, not delegates.