Something else that's interesting out of the Flynn indictment is that Mueller has structured the plea offer in such a way to make it pardon proof:
https://www.justice.gov/file/1015121/download
page 5, section 8(g) and page 6, Section 9(b)
Basically, Flynn isn't to be sentenced until after Trump is out of office (can't pardon a crime that a sentence hasn't been laid down for) and all charges being waived snap back into place if the sentence is vacated for any reason and can be tried at the state level (which can't be pardoned by the President).
It sure looks like the dream team has figured out how to structure these deals in such a way that Trump can't get his people out.
Another really interesting aspect of the Flynn plea is that Flynn broke partially because he was at the end of his financial rope. Flynn had put his house up for sale largely due to his mounting legal costs. How many people involved in all of this are going to see that and question if Donnie really has their back?