Cruz would be 1000% more effective than Rudy if we could trust him not to double-cross Trump. Rudy 2017 doesn’t have the fire in the belly the old US Attorney Rudy had.
It’s practically the role Cruz was born for - to clean out the arrogant, corrupt, left-wing ideologue scum entrenched in the DOJ and get in their faces.
Your Question answers itself. No.