The theory that nitriding 7-bolt cranks in 2g blocks eliminates crankwalk has been tested and the studies did not involve nitriding 7-bolt cranks in 2g blocks?
That would certainly skew the results.
Developing a solution cannot be done exclusively on paper - this is an empirical question. When those 400 or so randomly selected cranks in 2g blocks are nitrided and sent on their way, along with a significant group of rebuilds that do not include the nitrided crank, and 150k miles later these engines return with a significantly lower rate of crankwalk incidents in the nitrided group, then this possible solution will have been tested, at which point we can dub it "Jerry's Law".