At the absolute best for your position, this is a stalemate
It's not. My Harvard professor is of a more senior ranking than yours, and level of authority is what you are going by, so I win.
Article I, Section 3: "The Senate shall have the sole Power to try all Impeachments. When sitting for that Purpose, they shall be on Oath or Affirmation. When the President of the United States is tried, the Chief Justice shall preside: And no Person shall be convicted without the Concurrence of two thirds of the Members present."
https://www.heritage.org/constitution/articles/1/legislativeUntil the articles of impeachment are transmitted to The Senate, the act of impeachment is not complete as it is their responsibility to do so to meet the constitutional standards of impeachment.
That quoted section infers none of your personal conclusion. How can a senate try an impeachment if it didn't happen? We're not talking about a conviction by the senate -- that's not even part of what is being debated.
C'mon, try harder. Its not like I'm asking you to produce documents that aren't available to the public.