Real power is displayed by going in and kicking ass.
Not by giving Sadr 72 hours or 72 seconds.
The fact that he has done so is proof that the minister either is circumscribed in his powers to remove Sadr, or unsure that he has that ability at all.
Sadr can see this pretty clearly.
The Iraqi federal government has sent 15,000 security forces and they are "conducting aggressive military operations trying to rid the city of militias, thugs, smugglers that have been plaguing it for months".
I'm guessing fat-boy sees it more clearly...than you do.