Let's say Trump had an expectation for Pence to coward out and the votes to go against him on jan 6th but he had a plan to somehow still end up winning. Like if he activated the military after that point and everything to this point was to justify that. But then why invite the crowd? It's a serious morale loss and he knows that Patriots are ready to go 1776 on this. It could cost some people their lives. It would make MAGA look like BLM in terms of violence instead of taking the high road like they've done so far. The move if he expected Jan 6th to be an L would be to not have the crowd.
So the results should be neutral or good on Jan 6th if everything is going to Trump's plan.
Another perfectly reasonable explanation is that Trump knows that the optics of millions of people there supporting him will help him in a debate, with state legislatures, and with his chances in a following election should his efforts tomorrow fail. I don't believe there is some master plan that's supposed to happen, and that's not because I'm unfaithful, but it's because that's how the world works. Trump is a person that makes things happen because he puts himself in a good position to be able to do so. He can't anticipate what will happen any better than many of us, but if something fortunate does happen tomorrow, Trump will be ready and will be in a great position to be successful.