I don’t see anything wrong with letting this go to Holder’s deputy, do you? Her specialty is investigating corruption, not giving slaps on the wrist to bankers. I don’t doubt she’s political as heck, but I don’t think there is any getting away from that.
There is also the virtue of the fact that the Deputy won’t be justification for yet another hashing over of old cases that have already been politicized to death (in some cases literally)! The country might actually get a chance to move on, mend fences, and heal.