Re: Pence.
I read (can't remember where now) that he feels the threat of the 25th is more effective in keeping Trump in line rather than him announcing he's going to do it.
However in the background discussions have gone on about if they have enough members of the cabinet left to do this if it came to it (and if acting cabinet members were eligible to vote).
This is obviously speculation but it does make sense that Pence calling on the 25th doesn't automatically mean it would be passed as he would need a cabinet majority.
Thing is that if he attempts to do this and can't get a majority then there's nothing to keep hold over Trump as impeachment can't happen quickly enough.
So if he did do this he'd need to be damn sure he could bring it home as it were.
Also added to the mix is what's in it for him? He's got his eyes on the Presidency and in that regard I think invoking the 25th would be an absolute last resort- or Trump would have to attempt to do something so dangerous Pence didn't have a choice.
As is I think they probably feel they can contain him until the 20th...let's hope they are right.