Never underestimate the value of experience. This battle was on three overlapping fronts. One political, one legal and one executive privilege. Rudy handled the political front using his both his prior legal background and his political background as his authority. Based on the results of recent trends reflected in polls on how the public viewed the Mueller case, I would say the political front has been winning in spite of the full onslaught of the biased media and the Democrat party machine.
I would have to give Rudy more than partial credit for that success.
As for how he may have contributed to the actual legal work in the background I doubt he played much of an active day to day role other than as a sounding board and second opinion about strategy for Trump. Keeping a volatile client on a steady course is a job in itself.
I agree that Rudy took care of business.
Of course, this is the Swamp, and business there is very messy.
Our grandchildren will be lucky if they can figure out what really went on behind closed doors....