Republicans I spoke with today, some of them still hungover from celebrating what felt to many like a victory-night celebration in Milwaukee, registered shock at the news of Biden’s departure. Party officials had left town believing the race was all but over. Now they were confronting the reality of reimagining a campaign—one that had been optimized, in every way, to defeat Biden—against a new and unknown challenger. “So, we are forced to spend time and money on fighting Crooked Joe Biden, he polls badly after having a terrible debate, and quits the race,” a clearly peeved Trump wrote Sunday on Truth Social. “Now we have to start all over again.”

For months, in talking with Wiles and LaCivita, I was struck by their concern about the potential of a dramatic switch—Democratic leaders pushing out Biden in favor of a younger nominee. They told me that Trump’s campaign was readying contingency plans and studying the weaknesses of would-be alternatives, beginning with Vice President Kamala Harris. By the time of the debate, however, they believed that Democrats’ window had all but closed. Even in the immediate aftermath—as Democratic officials openly called for Biden to quit—Wiles and LaCivita were betting on the status quo. More than anything, Trump’s allies believed that the president’s stubborn Irish ego wouldn’t let him back out of a fight with a man he despised.

There’s a lot in this article. But the overarching theme is Trump and his team never thought Biden would step aside. It completely flips the narrative they’d been crafting, and blows some holes in the attacks they’ve made on “crooked” Joe Biden.

The article doesn’t say this, but I would guess that Trump assumed Biden would be too much like himself, which is to say Trump would never willingly step aside for anyone.