Actually, I don’t find the idea that Trump didn’t expect to win and was just having fun running so unlikely. He certainly has said since that being President has not been as easy as he thought.
You simply cannot produce hundreds of rallies and make presentations to them between three and five times per day for months on end, unless you have a high that is fed by a desire to win.
Trump was not simply going through the motions, because he would have run out of steam 25% of the way through, if that had been his motive.
The Russian collusion story has fallen flat. They’re now moving on the dementia, didn’t want to win, attacking the family, and God only knows what else.
Not buying any of it.