A bit of speculation here from a guy who's been in a few local bureaucratic scrambles....
Out of all the alternatives with the former head of ATF... keeping him in-house (and more than likely at his current pay rate, until a quiet retirement) is far preferable to firing/prosecuting him since he might just speak up then.... Remember what old LBJ is supposed to have said about firing Hoover.... better him inside the tent pissing out than outside the tent pissing in....
I believe that's what we're seeing as they continue to play defense. My next guess is that they'll delay, confound, and obstruct every attempt to get any records that might be a problem... until they're finally out of office. If you're in that world you can't trust the folks you work for, can't trust the folks you work with, and an honest individual is likely to get ground up if it's needed.
Anyone want to work for ATF? I did many years ago. Thank heavens I stayed in local law enforcement - that was bad enough.