I address this question just to the conspiracy theorists. I have one source (Tom Montalk, which I found Googling it) that offers some post-election reflections on how Trump could be declared a winner. Do you agree with this?

The whole thing rests on the assumption that drumpf et al are arguing from a position of good faith.
They are not. They are whipping their supporters into a frenzy to destroy confidence in the electoral process, and to delay certification so that they can pressure states to appoint drumpf-loyal electors and ignore the will of voters, and/or have a stacked and biased supreme court declare him the winner of the election.

It also assumes that there was widespread election fraud, and that the drumpf campaign has evidence of it.
They do not. If they did, they would have presented this evidence already in the myriad of lawsuits they started. Instead what they have argued are technicalities, and tried to use a handful of voters who had their votes invalidated, to convince the court to invalidate the votes of millions of other voters.
And so far, not one of their lawsuits have been ultimately successful.
Some of those lawsuits have been notable due to the complete incompetence that drumpf lawyers put on display.

From the recent PA lawsuit that was dismissed:

“In this action, the Trump Campaign and the Individual Plaintiffs (collectively, the “Plaintiffs”) seek to discard millions of votes legally cast by Pennsylvanians from all corners – from Greene County to Pike County, and everywhere in between.
In other words, Plaintiffs ask this Court to disenfranchise almost seven million voters.
This Court has been unable to find any case in which a plaintiff has sought such a drastic remedy in the contest of an election, in terms of the sheer volume of votes asked to be invalidated.

One might expect that when seeking such a startling outcome, a plaintiff would come formidably armed with compelling legal arguments and factual proof of rampant corruption, such that this Court would have no option but to regrettably grant the proposed injunctive relief despite the impact it would have on such a large group of citizens.

That has not happened.
Instead, this Court has been presented with strained legal arguments without merit and speculative accusations, unpled in the operative complaint and unsupported by evidence. In the United States of America, this cannot justify the disenfranchisement of a single voter, let alone all the voters of its sixth most populated state. Our people, laws, and institutions demand more. At bottom, Plaintiffs have failed to meet their burden to state a claim upon which relief may be granted.

Therefore, I grant Defendants’ motions and dismiss Plaintiffs’ action with prejudice.”

Naming the source would be helpful so we could see what they are offering. If you posted a cut/paste quote from the source, I see things that make me question right out of the gate. But in theory, there are still ways Trump could win the election. It is still in play. Some of what you have in your question is/has already happening/happened. The media has declared Biden the winner despite the fact there is on-going challenges and that the electoral college has not met yet to decide things. And they are continuing to sing that song and persecute Trump at every turn, even though they are in the wrong. That is called propaganda. Another thing that could happen is that a special prosecutor could be put into place to investigate voter fraud and do an in-depth investigation of all the evidence. If that happens, even if Biden is declared the winner, he really can’t stop it. If he tried, it would be Obstruction of Justice and he could be impeached right out of the gate.

6. Sidney Powell

Sidney Powell has proved too crazy even for the clowns around Trump. She was appearing with Rudy just a few days ago. Today they claim she isn’t on the team. What a freak show.

“Sidney Powell is practicing law on her own. She is not a member of the Trump Legal Team. She is also not a lawyer for the President in his personal capacity.”

- Rudy Giuliani, Attorney for President Trump, and Jenna Ellis, Trump Campaign Senior Legal Adviser and Attorney for President Trump

The putative proponent of the piffle:

“Since the election was not a clear win for Trump (yet) due to election fraud”

Tom Montalk is the author of “Fringe Knowledge For Beginners,” “Discerning Alien Disinformation,” and “Transcending The Matrix Control System Volumes I and II.” Tom’s work is a “Must Read” for those struggling to understand the true nature of Reality, Alien and Occultic Entity Interference, Metaphysics and Hidden Secret Science.
In what is destined to become an instant Classic, Tom Montalk returns to The Cosmic Switchboard Show to discuss the Principles of Military Strategy and Tactics as it applies to Spiritual Warfare and Spiritual Protection. Tom has studied Sun Tzu, Von Clausewitz and other strategists and theorists in the Military Art of War and has applied their principles to spiritual warfare both from an offensive and a defensive standpoint. Tom talks about “The Synchronicity of Protection.”
In Part 2 Tom Montalk Current Trends and Future Implications relative to global cataclysms, ET strategies and Timelines and Time Travel.

The courts keep throwing most of the cases out for lack of proof.

My opinion is the crazy alt-right, foreign entities, and trolls, keep sending out all of this messaging across social media to keep people wound up, anxious, afraid, and angry. Trump goes along with it, because he knows how effective it is.

It’s a clear win. It just took a long time to count, which was done on purpose by the Republicans to cause more doubt and anxiety.