Yesterday Trump's team was going to call up Pelosi as first witness when the house managers pulled out a witness ploy to minimize the optics damage from the day before.
I don't think Pelosi talking off the cuff in front of the free world is where the dems want to go, so they bailed. immediately.
Dems have a glass jaw.
For whatever reason, drugs, prescription or otherwise, alcohol addiction, dementia, and so on, Pelosi can't be put in an ad lib, free, non-scripted question and answer session, and she's the one calling plays in the huddle.
That's where you run the ball against them when you need the first down, and the world knows it now.