Do you remember back about 2 or 3 months before the election when Pelosi came out and mentioned the 25th amendment? Everyone seemed to think she was talking about Trump but actually she wasn't talking about him. She was sending out a message to all the dems to not "worry about all of Biden dementia gaffs because when he is in we will do the 25th, so don't worry about a thing."
How do I know that? Because the dems stopped hinting about Biden's "problems." And, she did not go after Trump with the 25th.
So, it was the plan all along to get the dementia guy in and they would adjust it with another one of their kind.