Although Holder is a despicable human, one thing about him and his term as AG, he stood by 0bammy and fought for him. In that regard, he was a good AG. Trump really never had a AG. Let alone one that helped him.
Yepp ... to get confirmed many of Trump’s nominees had to say explicitly or something to the effect that they would be think and act independently of the elected POTUS - Trump.
Barr was a great disappointment to say the least.
An AG worth his salt would not consider himself at the behest of anyone, or anything, except the law.