Scooter Libby didn't fall on anything - he was indicted for giving false statements. He was tripped up in questioning. The comments for which he was charged had nothing to do with Bush....MUCH like how the 2 indictments Mueller have don't have anything to do with Trump.
Quite the contrary... if Scooter said he outed Plame on the orders of Bush or Cheney, they'd have been in serious trouble. But he fell on his sword, took all the blame himself after trying to lie his way out of it, and Bush commuted his sentence. (Cheney was upset Bush didn't give him a full pardon.)
Don't see Manafort or Flynn taking one for the team like that.