I agree, but the office of the AG appointed the SC, monitors the SC, and if the SC misses one detail of the regulations governing either the SC or the US Attorneys the SC can easily be fired with cause. If Durham fails to brief MG of some effort/ charge/intention (i.e. tries to hide something for fear the AG will stop it) that will give the AG all the ammo he needs. The SC is not nearly as untouchable legally as some people think. However the AG can't tell the SC he can't do something because he disagrees with the SC as long as what the SC is doing follows the regulations and the action is legal.

The whole Special Counsel or the old Independent Counsel thing is a somewhat grey area and is ripe for abuse from both sides (like using it to get a desired political outcome, or keeping it running for years running up a large drain on taxpayer's money).