Similar train of thought......
The WB complaint is something and it was all going to come out Thursday regardless one way or the other. So when Schumer suggests this measure, go along with it because then you can say - I've now read the WB complaint - Nothing burger - he shouldn't be impeached. I thought there would be more/etc. (Maybe even WB didn't have first hand knowledge - what a political hit job)
I think it's unlikely Trump said on the "public" recordings already approved congressional aid for investigation. He likely just said - stamp out corruption - look into Biden, etc. Then he tasked Rudy to go there and deliver the Aid for investigation demand in person. Why else is he dispatching Rudy? Everyone will 100% excuse and ignore and justify the fact that Trump released the aid last week when this story started gaining traction though.
So IMHO - they think they can win the argument. They think they have the American public on the proposition that it's OK for the President to ask a foreign government to open an investigation of a political opponent or their family. They think they can defend the timing of the aid being provided last week and make the story about Biden attempts to influence Ukraine when he was VP to not investigate.
Anyone thinking Mitch grew a spine or grew a heart or is somehow doing the right thing for 'Merica has not been paying attention. He knows he wins the argument if he lets it all play out. Either because the WB complaint is nothing or because they think they win the debate/argument or maybe because Trump is dead in the water and its worse than anyone knows so best to jump ship now. So yeah, put me down in the they think they win the argument column.